A224618 Number of (n+4)X5 0..2 matrices with each 5X5 subblock idempotent

54182, 20465, 23914, 32029, 39001, 43489, 54070, 79918, 122542, 187631, 273520, 383006, 535709, 762005, 1106184, 1626730, 2385788, 3471665, 5021971, 7252751, 10500500, 15253690, 22196507, 32295594, 46934366, 68138057, 98892534

Offset

1,1

Comments

Column 1 of A224625

Links

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

Formula

Empirical: a(n) = 2*a(n-1) -a(n-2) +a(n-3) -2*a(n-4) +2*a(n-5) -a(n-7) -a(n-9) +a(n-10) -a(n-11) +a(n-12) for n>18

Example

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

Crossrefs

Sequence in context: A202467 A224617 A224625 * A254263 A254256 A254302

Adjacent sequences: A224615 A224616 A224617 * A224619 A224620 A224621

Keyword

nonn

Author

R. H. Hardin Apr 12 2013

Status

approved