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A297540 Number of nX4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1s. 1
1, 24, 93, 275, 2205, 13248, 67215, 401415, 2403621, 13717554, 79734011, 467605069, 2718919839, 15817878296, 92253538261, 537481451021, 3130277448285, 18239061232932, 106267286686423, 619075960613237, 3606738104606245 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A297544.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +6*a(n-2) +48*a(n-3) -58*a(n-4) -327*a(n-5) -368*a(n-6) +322*a(n-7) +1099*a(n-8) +949*a(n-9) +1014*a(n-10) +648*a(n-11) +1037*a(n-12) +38*a(n-13) -301*a(n-14) -141*a(n-15) -197*a(n-16) -151*a(n-17) -27*a(n-18) +33*a(n-19) +32*a(n-20) +3*a(n-21) -2*a(n-22)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A297544.

Sequence in context: A233637 A179962 A076799 * A055671 A090214 A283446

Adjacent sequences:  A297537 A297538 A297539 * A297541 A297542 A297543

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2017

STATUS

approved

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Last modified October 17 21:17 EDT 2021. Contains 348065 sequences. (Running on oeis4.)