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A302517 Number of 4Xn 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
8, 6, 9, 28, 36, 80, 235, 541, 1115, 2554, 6095, 13920, 31216, 71431, 164589, 375943, 856294, 1957963, 4481840, 10241792, 23394379, 53477141, 122262891, 279435298, 638618663, 1459697640, 3336520448, 7626024455, 17430072821, 39839300103 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A302515.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +3*a(n-3) +5*a(n-4) -a(n-5) -5*a(n-6) -4*a(n-7) for n>10

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Cf. A302515.

Sequence in context: A249103 A116517 A081544 * A326285 A104668 A254337

Adjacent sequences:  A302514 A302515 A302516 * A302518 A302519 A302520

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 09 2018

STATUS

approved

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Last modified October 15 17:45 EDT 2021. Contains 348033 sequences. (Running on oeis4.)