T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums.

A186871

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums.

Terms

    a(0) =0a(1) =171a(2) =171a(3) =361a(4) =2121a(5) =361a(6) =3645a(7) =24414a(8) =24414a(9) =3645a(10) =13365a(11) =285724a(12) =431016a(13) =285724a(14) =13365a(15) =94905a(16) =3409112a(17) =12048996a(18) =12048996a(19) =3409112a(20) =94905a(21) =424845a(22) =40893800a(23) =270129432a(24) =630235528a(25) =270129432a(26) =40893800a(27) =424845a(28) =2682129a(29) =492154924

External references