A224587 Number of (n+6)X13 0..1 matrices with each 7X7 subblock idempotent.

146715, 28629, 29066, 31741, 34107, 35891, 37202, 38192, 43958, 54300, 68099, 84280, 102048, 120877, 140440, 165512, 200668, 249364, 313981, 396105, 496796, 616787, 761586, 941276, 1169396, 1461866, 1836192, 2310940, 2905409, 3644406

Offset

1,1

Comments

Column 7 of A224588

Links

R. H. Hardin, Table of n, a(n) for n = 1..96

Formula

Empirical: a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +a(n-7) -3*a(n-8) +3*a(n-9) -a(n-10) for n>16

Example

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

Crossrefs

Sequence in context: A204527 A345753 A110084 * A004670 A111044 A189789

Adjacent sequences: A224584 A224585 A224586 * A224588 A224589 A224590

Keyword

nonn

Author

R. H. Hardin, Apr 11 2013

Status

approved