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A302955 Number of 4Xn 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
0, 34, 587, 6531, 87901, 1248691, 17374552, 240722070, 3341034465, 46388257442, 643972648584, 8939498283852, 124098004402538, 1722731575686989, 23914973741837431, 331987784574422416, 4608656564514739063 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A302953.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +64*a(n-2) +323*a(n-3) +1423*a(n-4) +2602*a(n-5) -1745*a(n-6) -17308*a(n-7) -49332*a(n-8) -76942*a(n-9) -37653*a(n-10) +24133*a(n-11) +51188*a(n-12) +90867*a(n-13) +48713*a(n-14) -32390*a(n-15) -35672*a(n-16) -23781*a(n-17) +15831*a(n-18) +22745*a(n-19) -4476*a(n-20) -2492*a(n-21) -8*a(n-22) -1296*a(n-23) +576*a(n-24) for n>25

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Cf. A302953.

Sequence in context: A089938 A126924 A035712 * A161647 A161991 A162381

Adjacent sequences:  A302952 A302953 A302954 * A302956 A302957 A302958

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 16 2018

STATUS

approved

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Last modified July 23 10:56 EDT 2021. Contains 346259 sequences. (Running on oeis4.)