A259997 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101

641, 1819, 6157, 12620, 23680, 74850, 197804, 383548, 942638, 2727852, 6128454, 13250442, 35951522, 91093240, 199168800, 485362526, 1276770070, 2989412528, 6882229004, 17541213370, 43445183724, 100482691170, 244053647200

Offset

1,1

Comments

Column 4 of A260001

Links

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

Formula

Empirical: a(n) = 3*a(n-2) +10*a(n-3) +25*a(n-4) -27*a(n-5) -99*a(n-6) -107*a(n-7) -136*a(n-8) +291*a(n-9) +668*a(n-10) +342*a(n-11) +145*a(n-12) -1029*a(n-13) -1042*a(n-14) +184*a(n-15) +1132*a(n-16) -216*a(n-17) -2049*a(n-18) -141*a(n-19) +321*a(n-20) +457*a(n-21) -4*a(n-22) +44*a(n-24) -352*a(n-25) +279*a(n-26) for n>30

Example

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

Crossrefs

Cf. A260001

Sequence in context: A105130 A117129 A106488 * A256806 A206164 A206378

Adjacent sequences: A259994 A259995 A259996 * A259998 A259999 A260000

Keyword

nonn

Author

R. H. Hardin, Jul 12 2015

Status

approved