The On-Line Encyclopedia of Integer Sequences (OEIS)

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A201886

Number of zero-sum nX3 -2..2 arrays with every element equal to at least one horizontal or vertical neighbor
(history; published version)

#5 by Russ Cox at Sat Mar 31 12:36:45 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Dec 06 2011

Discussion

Sat Mar 31

12:36

OEIS Server: https://oeis.org/edit/global/875

#4 by Ron Hardin at Tue Dec 06 10:42:48 EST 2011

STATUS

editing

approved

#3 by Ron Hardin at Tue Dec 06 10:42:45 EST 2011

LINKS

R. H. Hardin, <a href="/A201886/b201886.txt">Table of n, a(n) for n = 1..32</a>

#2 by Ron Hardin at Tue Dec 06 10:42:23 EST 2011

NAME

allocated for Ron HardinNumber of zero-sum nX3 -2..2 arrays with every element equal to at least one horizontal or vertical neighbor

DATA

1, 63, 765, 26003, 559115, 16513425, 435630965, 12576072219, 355197660509, 10318921933459, 299385686951737, 8776646594694357, 257891661687979323, 7614010950576116449, 225337048658653360699, 6687122593012508859001

OFFSET

1,2

COMMENTS

Column 3 of A201888

EXAMPLE

Some solutions for n=4

..2.-2.-1....2..2.-2...-1.-1.-1....1..1.-1....1..2..0....1.-2.-2....2.-1..2

..2.-2.-1...-1.-1.-2....2..0..0...-1..0.-1....1..2..0....1..1.-2....2.-1..2

.-1..0..0...-1..1..1....2..2..0...-1..0..2...-2.-2..0....1..0..1...-2.-1..0

.-1..2..2...-1..1..1...-1.-1.-1...-1.-1..2...-1.-1..0....0..0..1...-2.-1..0

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Dec 06 2011

STATUS

approved

editing

#1 by Ron Hardin at Tue Dec 06 10:37:17 EST 2011

NAME

allocated for Ron Hardin

KEYWORD

allocated

STATUS

approved