A263910 Number of (2n+1)X(5+2) 0..1 arrays with each row and column modulo 3 equal to 1, read as a binary number with top and left being the most significant bits.

261, 252097, 394241389, 699094613961, 1279198648576981, 2359070696262035857, 4359072407628680510589, 8058606466810736529591961, 14899753037585810536219347301, 27549360802535095584399290453217

Offset

1,1

Comments

Column 5 of A263913 (nonzero terms).

Links

R. H. Hardin, Table of n, a(n) for n = 1..105

Formula

Empirical: a(n) = 2642*a(n-1) -1657924*a(n-2) +374408210*a(n-3) -37990009963*a(n-4) +1835366524700*a(n-5) -41459941330192*a(n-6) +388755630229568*a(n-7) -999778121036800*a(n-8)

Example

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

Crossrefs

Cf. A263913.

Sequence in context: A264894 A028536 A238909 * A345568 A345824 A045179

Adjacent sequences: A263907 A263908 A263909 * A263911 A263912 A263913

Keyword

nonn

Author

R. H. Hardin, Oct 29 2015

Status

approved