T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge or main diagonally.
A251292
T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge or main diagonally.
Terms
- a(0) =9a(1) =22a(2) =22a(3) =52a(4) =71a(5) =52a(6) =125a(7) =219a(8) =219a(9) =125a(10) =297a(11) =701a(12) =822a(13) =701a(14) =297a(15) =710a(16) =2193a(17) =3390a(18) =3390a(19) =2193a(20) =710a(21) =1691a(22) =6980a(23) =12954a(24) =18924a(25) =12954a(26) =6980a(27) =1691a(28) =4036a(29) =21966
External references
- oeis: A251292