A263034 Number of (n+2)X(2+2) 0..1 arrays with each row and column not divisible by 5, read as a binary number with top and left being the most significant bits.

512, 6928, 92472, 1198816, 14394128, 174159952, 2100720600, 25327918144, 303937235408, 3649959544336, 43807632440376, 525844497250336, 6310134549806480, 75726848781701584, 908720872928731032

Offset

1,1

Comments

Column 2 of A263040.

Links

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

Formula

Empirical: a(n) = 14*a(n-1) -52*a(n-2) +440*a(n-3) +1940*a(n-4) -42136*a(n-5) +130832*a(n-6) -1272928*a(n-7) +234026*a(n-8) +34403252*a(n-9) -63189880*a(n-10) +952057808*a(n-11) -516283820*a(n-12) -10970711960*a(n-13) +9550612240*a(n-14) -282398311520*a(n-15) +96140026255*a(n-16) +1404615957550*a(n-17) -501871284980*a(n-18) +34714525551160*a(n-19) -5440122625184*a(n-20) -68377213321664*a(n-21) +6191483638912*a(n-22) -1653436086997760*a(n-23) +68472989925120*a(n-24) +824525429054976*a(n-25) -5699099907072*a(n-26) +19800008497133568*a(n-27) -63128491278336*a(n-28) -757541895340032*a(n-29) -18181005488160768*a(n-31)

Example

Some solutions for n=3
..0..1..1..1....0..1..0..0....1..1..0..0....0..1..1..0....0..0..1..0
..0..0..1..0....1..0..0..1....1..0..1..1....1..0..1..1....1..1..0..1
..1..1..0..0....0..1..1..1....0..0..1..1....1..1..0..0....1..1..0..0
..0..1..0..0....0..1..1..0....1..1..0..0....1..0..1..1....0..1..1..1
..0..1..0..0....1..1..0..0....1..1..0..0....0..1..1..1....0..0..0..1

Crossrefs

Cf. A263040.

Sequence in context: A258999 A253833 A017487 * A254012 A258518 A222775

Adjacent sequences: A263031 A263032 A263033 * A263035 A263036 A263037

Keyword

nonn

Author

R. H. Hardin, Oct 08 2015

Status

approved