A260925 Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101

491, 831, 3358, 10617, 27582, 81848, 253264, 736065, 2137558, 6366003, 18836612, 55281733, 162975870, 481592042, 1419353824, 4182760615, 12337678966, 36391723458, 107281631494, 316367367773, 932912838818, 2751181217369

Offset

1,1

Comments

Column 6 of A260927

Links

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

Formula

Empirical: a(n) = a(n-2) +54*a(n-4) +147*a(n-6) -232*a(n-8) -760*a(n-10) +1201*a(n-12) +1735*a(n-14) -4951*a(n-16) +1746*a(n-18) +4365*a(n-20) -3877*a(n-22) -2176*a(n-24) +4748*a(n-26) -2239*a(n-28) +25*a(n-30) +151*a(n-32) +117*a(n-34) -35*a(n-36) -2*a(n-38) -a(n-40) for n>42

Example

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

Crossrefs

Cf. A260927

Sequence in context: A180457 A271664 A082079 * A217118 A205200 A205058

Adjacent sequences: A260922 A260923 A260924 * A260926 A260927 A260928

Keyword

nonn

Author

R. H. Hardin, Aug 04 2015

Status

approved