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A303514 Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 25, 78, 230, 801, 2764, 9367, 31703, 107876, 366903, 1247178, 4239444, 14413593, 49004114, 166604979, 566429535, 1925785826, 6547430725, 22260469676, 75682984684, 257313518769, 874837061986, 2974348729093, 10112457309015 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A303513.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -7*a(n-2) -9*a(n-3) +6*a(n-4) -3*a(n-5) +48*a(n-6) +22*a(n-7) -35*a(n-8) -104*a(n-9) -47*a(n-10) +77*a(n-11) +110*a(n-12) -13*a(n-13) -56*a(n-14) +12*a(n-15) for n>16

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A303513.

Sequence in context: A125309 A273361 A266126 * A041991 A027764 A095669

Adjacent sequences:  A303511 A303512 A303513 * A303515 A303516 A303517

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 25 2018

STATUS

approved

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Last modified April 25 16:08 EDT 2019. Contains 322461 sequences. (Running on oeis4.)