Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 or 00000001.
A259637
Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 or 00000001.
Terms
- a(0) =69a(1) =171a(2) =581a(3) =1483a(4) =3849a(5) =11261a(6) =30957a(7) =82977a(8) =231015a(9) =639787a(10) =1746635a(11) =4808581a(12) =13273939a(13) =36465831a(14) =100266697a(15) =276172373a(16) =759825267a(17) =2089908821a(18) =5751835379a(19) =15827945517a(20) =43546434477a(21) =119824549005a(22) =329723993993a(23) =907239344187
External references
- oeis: A259637