A224576 Number of (n+5)X12 0..1 matrices with each 6X6 subblock idempotent

28708, 7843, 8294, 9164, 9946, 10561, 11032, 12921, 16072, 20202, 25024, 30332, 35979, 43392, 53814, 68241, 87358, 111648, 141447, 178530, 225887, 287540, 368172, 472953, 607389, 778773, 997360, 1277463, 1638054, 2103279, 2702790, 3473544

Offset

1,1

Comments

Column 7 of A224577

Links

R. H. Hardin, Table of n, a(n) for n = 1..192

Formula

Empirical: a(n) = 3*a(n-1) -3*a(n-2) +a(n-3) +2*a(n-6) -5*a(n-7) +4*a(n-8) -a(n-9) -a(n-12) +2*a(n-13) -a(n-14) for n>18

Example

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

Crossrefs

Sequence in context: A172755 A172827 A145686 * A234835 A255659 A213460

Adjacent sequences: A224573 A224574 A224575 * A224577 A224578 A224579

Keyword

nonn

Author

R. H. Hardin Apr 10 2013

Status

approved