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A302310 Number of 2Xn 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 4
2, 3, 11, 21, 31, 113, 363, 813, 1751, 5001, 14051, 34053, 82063, 218273, 579291, 1452381, 3638471, 9447993, 24526163, 62318133, 158325631, 407598161, 1049289291, 2679681933, 6843284663, 17562012393, 45069368771, 115317418341 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A302309.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -a(n-2) +4*a(n-3) +12*a(n-4) -16*a(n-5) for n>6

EXAMPLE

Some solutions for n=5

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

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

CROSSREFS

Cf. A302309.

Sequence in context: A097895 A298351 A023182 * A295958 A049083 A305719

Adjacent sequences:  A302307 A302308 A302309 * A302311 A302312 A302313

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 05 2018

STATUS

approved

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Last modified January 21 06:26 EST 2022. Contains 350473 sequences. (Running on oeis4.)