Number of (n+1) X (1+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0001 0011 0101 or 1111.
A259517
Number of (n+1) X (1+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0001 0011 0101 or 1111.
Terms
- a(0) =12a(1) =38a(2) =120a(3) =380a(4) =1204a(5) =3816a(6) =12096a(7) =38344a(8) =121552a(9) =385328a(10) =1221520a(11) =3872320a(12) =12275584a(13) =38914656a(14) =123362816a(15) =391070784a(16) =1239728192a(17) =3930045568a(18) =12458584320a(19) =39494789760a(20) =125201899264a(21) =396900848896
External references
- oeis: A259517