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A297764 Number of 3 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 4 neighboring 1's. 1
1, 4, 52, 206, 734, 4088, 24801, 130159, 666434, 3560105, 19245643, 102730864, 546125038, 2913904858, 15571288925, 83122383401, 443489006259, 2366877041892, 12634189755271, 67434790018093, 359910312437155, 1920940558913908 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 3 of A297762.
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) -5*a(n-2) +8*a(n-3) +53*a(n-4) -295*a(n-5) -76*a(n-6) +556*a(n-7) +178*a(n-8) +196*a(n-9) +145*a(n-10) -779*a(n-11) -628*a(n-12) +226*a(n-13) +100*a(n-14) +275*a(n-15) +152*a(n-16) -65*a(n-17) -32*a(n-18) -26*a(n-19) -4*a(n-20).
EXAMPLE
Some solutions for n=7
..0..0..0..0..1..1..0. .0..1..1..1..1..1..0. .0..0..0..0..1..0..0
..1..1..1..0..1..1..1. .0..1..1..1..1..0..1. .0..0..0..1..1..1..0
..0..1..1..1..1..1..0. .0..0..0..0..0..1..0. .0..0..1..1..1..0..0
CROSSREFS
Cf. A297762.
Sequence in context: A336428 A298073 A233474 * A101354 A229146 A071953
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 05 2018
STATUS
approved

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Last modified April 18 13:50 EDT 2024. Contains 371780 sequences. (Running on oeis4.)