A223602 - OEIS

A223602

Petersen graph (8,2) coloring a rectangular array: number of 4Xn 0..15 arrays where 0..15 label nodes of a graph with edges 0,1 0,8 8,14 8,10 1,2 1,9 9,15 9,11 2,3 2,10 10,12 3,4 3,11 11,13 4,5 4,12 12,14 5,6 5,13 13,15 6,7 6,14 7,0 7,15 and every array movement to a horizontal, diagonal or antidiagonal neighbor moves along an edge of this graph

65536, 7424, 176224, 2372080, 43725920, 755683024, 13959069888, 258174966416, 4850832343904, 91505981537072, 1733729781877920, 32909491571349680, 625534833011886880, 11898376530083012208, 226422016143905134464

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 4 of A223599

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 22*a(n-1) +146*a(n-2) -4241*a(n-3) -7021*a(n-4) +296069*a(n-5) +84524*a(n-6) -10098300*a(n-7) +2841988*a(n-8) +193753372*a(n-9) -109915280*a(n-10) -2243896688*a(n-11) +1623516032*a(n-12) +16219469440*a(n-13) -13091056384*a(n-14) -74162963712*a(n-15) +62602426368*a(n-16) +215343361024*a(n-17) -182965936128*a(n-18) -395412119552*a(n-19) +329698951168*a(n-20) +450438201344*a(n-21) -361766191104*a(n-22) -303199682560*a(n-23) +230835617792*a(n-24) +107843944448*a(n-25) -76487327744*a(n-26) -15032385536*a(n-27) +9663676416*a(n-28) for n>29

EXAMPLE

Some solutions for n=3

..0..8..0....1..2.10....8.14..8....8.14..8....8.10..8....8..0..1....5..4..3

..0..1..0....1..2..3....8..0..8....8.10..8...12.14..8....7..0..8....3..4..3

..0..1..0...10..2..3....7..0..7....8..0..8....6.14..6....7..0..8....5..4..5

..9..1..2....1..2..1....7..0..8....8..0..8...12.14.12....1..0..7....5.13..5

CROSSREFS

Sequence in context: A188096 A188105 A188097 * A223695 A202939 A069277

Adjacent sequences: A223599 A223600 A223601 * A223603 A223604 A223605

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 23 2013

STATUS

approved