Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.
A260496
Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.
Terms
- a(0) =218a(1) =347a(2) =868a(3) =1756a(4) =2420a(5) =5219a(6) =11450a(7) =17686a(8) =34000a(9) =74901a(10) =127782a(11) =231220a(12) =493414a(13) =902322a(14) =1605968a(15) =3284745a(16) =6257230a(17) =11223229a(18) =22117862a(19) =42933197a(20) =78291428a(21) =150404230a(22) =293145834a(23) =543695449a(24) =1029765114a(25) =1999476726a(26) =3758265476
External references
- oeis: A260496