Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.
A260972
Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.
Terms
- a(0) =48a(1) =133a(2) =372a(3) =1513a(4) =4592a(5) =18706a(6) =45504a(7) =195280a(8) =441072a(9) =2093846a(10) =4057280a(11) =20962048a(12) =38827984a(13) =225849174a(14) =367470344a(15) =2376475916a(16) =3621888816a(17) =26598528246a(18) =37810953848a(19) =300880005340a(20) =400697050360
External references
- oeis: A260972