A263059 Number of (n+1)X(7+1) 0..1 arrays with each row and column not divisible by 3, read as a binary number with top and left being the most significant bits.

170, 113486, 19499266, 4880746710, 830550961170, 155157177242886, 26380510465997186, 4591006241105432150, 780492175300947773170, 133462112418824638334886, 22688696181791779887035106

Offset

1,1

Comments

Column 7 of A263060.

Links

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

Formula

Empirical: a(n) = 170*a(n-1) +12088*a(n-2) -2054960*a(n-3) -43463646*a(n-4) +7388819820*a(n-5) +66398454660*a(n-6) -11287737292200*a(n-7) -47263888640505*a(n-8) +8034861068885850*a(n-9) +16948827007298316*a(n-10) -2881300591240713720*a(n-11) -3142452853334937648*a(n-12) +534216985066939400160*a(n-13) +298488023933669046336*a(n-14) -50742964068723737877120*a(n-15) -13934074238604397209600*a(n-16) +2368792620562747525632000*a(n-17) +287178122770920663040000*a(n-18) -48820280871056512716800000*a(n-19) -2061386929701535744000000*a(n-20) +350435778049261076480000000*a(n-21)

Example

Some solutions for n=2
..1..0..1..1..1..1..1..1....1..0..0..0..1..1..1..1....1..1..0..1..0..1..1..0
..1..0..1..0..0..0..0..1....0..0..1..1..0..0..1..0....0..1..0..0..1..1..0..0
..1..1..1..1..1..1..0..1....1..1..0..0..0..0..1..0....0..1..1..0..0..1..1..1

Crossrefs

Cf. A263060.

Sequence in context: A250957 A114048 A187704 * A243294 A015975 A292090

Adjacent sequences: A263056 A263057 A263058 * A263060 A263061 A263062

Keyword

nonn

Author

R. H. Hardin, Oct 08 2015

Status

approved