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 A228281 Number of nX6 binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or nw-se diagonally. 2
 8, 28, 337, 2448, 21166, 172082, 1428523, 11771298, 97268701, 802886174, 6629901197, 54739811878, 451976078779, 3731849749697, 30812948919061, 254414847888742, 2100639733295629, 17344457600010491, 143208852222784259 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 6 of A228285 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA a(n) = a(n-1) +42*a(n-2) +147*a(n-3) +70*a(n-4) -478*a(n-5) -449*a(n-6) +1199*a(n-7) +732*a(n-8) -2727*a(n-9) +659*a(n-10) +3827*a(n-11) -5776*a(n-12) +3926*a(n-13) -1152*a(n-14) -148*a(n-15) +154*a(n-16) +32*a(n-17) -29*a(n-18) -6*a(n-19) +3*a(n-20) +a(n-21) EXAMPLE Some solutions for n=4 ..1..0..0..0..0..0....1..0..0..0..1..0....1..0..0..0..1..0....1..0..1..0..0..1 ..0..0..0..1..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0 ..0..1..0..0..0..1....0..0..0..0..0..0....0..0..1..0..0..1....0..0..0..0..0..0 ..0..0..0..0..1..0....0..0..0..1..0..1....0..0..0..0..0..0....0..0..0..1..0..0 CROSSREFS See A228277-A228285, especially the latter. Sequence in context: A200034 A230702 A244613 * A146977 A068623 A361585 Adjacent sequences: A228278 A228279 A228280 * A228282 A228283 A228284 KEYWORD nonn AUTHOR R. H. Hardin Aug 19 2013 EXTENSIONS Edited by N. J. A. Sloane, Aug 22 2013 STATUS approved

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Last modified March 27 12:57 EDT 2023. Contains 361570 sequences. (Running on oeis4.)