T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to 3 4 5 6 7 8 or 9.

A251507

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to 3 4 5 6 7 8 or 9.

Terms

    a(0) =226a(1) =3250a(2) =3250a(3) =46684a(4) =170038a(5) =46684a(6) =670690a(7) =8888108a(8) =8888108a(9) =670690a(10) =9635410a(11) =464687066a(12) =1690296520a(13) =464687066a(14) =9635410a(15) =138426508a(16) =24294592462a(17) =321542579960a(18) =321542579960a(19) =24294592462a(20) =138426508a(21) =1988695378

External references