Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000101.
A259946
Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000101.
Terms
- a(0) =60a(1) =170a(2) =549a(3) =1507a(4) =4128a(5) =11933a(6) =34337a(7) =97374a(8) =277073a(9) =791655a(10) =2258776a(11) =6438153a(12) =18360749a(13) =52375446a(14) =149376869a(15) =426006811a(16) =1215002568a(17) =3465304429a(18) =9883190601a(19) =28187259534a(20) =80391677785a(21) =229281523567a(22) =653922541496
External references
- oeis: A259946