A300431 - OEIS

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A300431

Number of nX4 0..1 arrays with every element equal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

2, 15, 33, 87, 238, 697, 1942, 5656, 16487, 48053, 140187, 410230, 1200987, 3516338, 10303811, 30218936, 88682815, 260386129, 764851328, 2247357212, 6604868430, 19414622795, 57075791496, 167812063057, 493440845883, 1451046727997

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

OFFSET

1,1

COMMENTS

Column 4 of A300435.

LINKS

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

EXAMPLE

Some solutions for n=5

..0..1..1..0. .0..0..1..1. .0..1..1..0. .0..1..0..0. .0..0..1..1

..0..0..0..0. .1..0..0..0. .0..1..0..1. .0..1..1..1. .1..0..0..0

..1..1..0..0. .1..1..1..1. .1..1..0..1. .0..0..0..0. .1..1..1..1