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A302954 Number of 3Xn 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, 11, 86, 519, 3626, 26167, 185810, 1317541, 9353154, 66404553, 471405566, 3346494089, 23756835310, 168650322345, 1197251824916, 8499313431065, 60336790015098, 428332035511083, 3040737367321452, 21586253123647687 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A302953.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +15*a(n-2) +37*a(n-3) +80*a(n-4) +68*a(n-5) +26*a(n-6) +5*a(n-7) for n>9

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A302953.

Sequence in context: A082365 A320940 A012794 * A014917 A080962 A243879

Adjacent sequences:  A302951 A302952 A302953 * A302955 A302956 A302957

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 16 2018

STATUS

approved

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Last modified October 15 23:54 EDT 2019. Contains 328038 sequences. (Running on oeis4.)