A259958 Number of (n+2) X (4+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001001.

353, 1187, 5449, 22622, 95505, 410928, 1749180, 7428045, 31652938, 134864351, 574177723, 2444862662, 10411688737, 44337641182, 188806035352, 804008747575, 3423786528448, 14579849166047, 62086786721703, 264389995026138

Offset

1,1

Comments

Column 4 of A259962.

Links

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

Formula

Empirical: a(n) = a(n-1) +6*a(n-2) +20*a(n-3) +54*a(n-4) +38*a(n-5) -41*a(n-6) -191*a(n-7) -285*a(n-8) +296*a(n-9) +753*a(n-10) -160*a(n-11) -791*a(n-12) -99*a(n-13) +334*a(n-14) +98*a(n-15) -18*a(n-16) +54*a(n-17) -3*a(n-18) -35*a(n-19) +3*a(n-20) -12*a(n-21) -7*a(n-22) +4*a(n-23) for n>25.

Example

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

Crossrefs

Cf. A259962.

Sequence in context: A142565 A265449 A142785 * A126657 A122718 A300364

Adjacent sequences: A259955 A259956 A259957 * A259959 A259960 A259961

Keyword

nonn

Author

R. H. Hardin, Jul 10 2015

Status

approved