A206470 Number of (n+1)X7 0..2 arrays with every 2X2 subblock having zero permanent

29241, 8963667, 356190129, 52552339515, 3420616959081, 377599682448675, 30374762423377761, 2996776279527835851, 262356222717008105625, 24807486299199737090355, 2243325257562176033089041

Offset

1,1

Comments

Column 6 of A206472

Links

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

Formula

Empirical: a(n) = 147*a(n-1) -783720*a(n-3) +22720320*a(n-4) +1208991744*a(n-5) -54468142848*a(n-6) -614613775104*a(n-7) +51672615856128*a(n-8) -95234427260928*a(n-9) -23998259218120704*a(n-10) +201605913386680320*a(n-11) +5689361505992048640*a(n-12) -76294817096637874176*a(n-13) -628017046749267886080*a(n-14) +13195491648030973624320*a(n-15) +14645283042051703701504*a(n-16) -1131405415550428045639680*a(n-17) +2665553144520224318423040*a(n-18) +45873154851254425563955200*a(n-19) -208791793059186748686336000*a(n-20) -694038525930408939356160000*a(n-21) +5010428057070448693739520000*a(n-22) -38126822008840601972244480000*a(n-24) +51697385774699121318297600000*a(n-25)

Example

Some solutions for n=4
..2..0..2..1..0..2..0....2..0..1..1..0..1..1....0..0..1..2..2..0..0
..1..0..0..0..0..1..0....1..0..0..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..0..0..2..0....2..0..0..2..2..1..0....0..2..2..1..2..0..0
..0..1..1..1..0..1..0....2..0..0..0..0..0..0....0..0..0..0..0..0..1
..0..0..0..0..0..0..0....0..0..2..1..2..1..0....0..2..2..0..1..0..1

Crossrefs

Sequence in context: A028462 A357272 A252860 * A194619 A058652 A250940

Adjacent sequences: A206467 A206468 A206469 * A206471 A206472 A206473

Keyword

nonn

Author

R. H. Hardin Feb 08 2012

Status

approved