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 A251288 Number of (n+1)X(4+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge or main diagonally 1
 125, 701, 3390, 18924, 94706, 518711, 2645966, 14292754, 73763850, 394839392, 2052818979, 10924134430, 57063130832, 302529963932, 1585024760524, 8383254978829, 44005652384769, 232393583625579, 1221371767402917 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A251292 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) +40*a(n-2) -55*a(n-3) -533*a(n-4) +518*a(n-5) +3271*a(n-6) -2001*a(n-7) -10562*a(n-8) +2928*a(n-9) +17984*a(n-10) -637*a(n-11) -15411*a(n-12) -1198*a(n-13) +6419*a(n-14) +561*a(n-15) -1099*a(n-16) -18*a(n-17) +50*a(n-18) -2*a(n-19) EXAMPLE Some solutions for n=4 ..1..0..0..1..1....1..0..0..0..1....1..1..1..0..1....0..0..0..0..0 ..0..1..0..0..0....1..0..1..0..0....0..0..0..0..1....1..1..1..1..0 ..0..0..1..1..0....1..0..0..0..1....1..1..1..0..1....0..0..0..0..1 ..1..0..0..0..0....1..0..1..0..0....0..0..0..0..1....1..0..1..0..0 ..0..0..1..0..1....1..0..0..1..1....1..1..1..0..1....0..0..0..0..1 CROSSREFS Sequence in context: A235896 A250634 A250944 * A060093 A253345 A016815 Adjacent sequences: A251285 A251286 A251287 * A251289 A251290 A251291 KEYWORD nonn AUTHOR R. H. Hardin, Dec 01 2014 STATUS approved

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Last modified September 24 22:14 EDT 2023. Contains 365582 sequences. (Running on oeis4.)