Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.
A261287
Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.
Terms
- a(0) =96a(1) =133a(2) =271a(3) =504a(4) =1086a(5) =2104a(6) =4715a(7) =9080a(8) =20093a(9) =38864a(10) =86229a(11) =166296a(12) =368773a(13) =712284a(14) =1579561a(15) =3049076a(16) =6762309a(17) =13056148a(18) =28953755a(19) =55898492a(20) =123967937a(21) =239336000a(22) =530772749a(23) =1024728804a(24) =2272547259a(25) =4387441960a(26) =9730031919
External references
- oeis: A261287