T(n,k) is the number of (n+1) X (k+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings).
A234169
T(n,k) is the number of (n+1) X (k+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings).
Terms
- a(0) =136a(1) =766a(2) =766a(3) =4296a(4) =4970a(5) =4296a(6) =24158a(7) =32070a(8) =32070a(9) =24158a(10) =135752a(11) =208412a(12) =236876a(13) =208412a(14) =135752a(15) =764190a(16) =1353986a(17) =1773484a(18) =1773484a(19) =1353986a(20) =764190a(21) =4299592a(22) =8846884a(23) =13227132a(24) =15427948a(25) =13227132a(26) =8846884a(27) =4299592a(28) =24233182a(29) =57811490
External references
- oeis: A234169