T(n,k)=Number of (n+1)X(n+1) 0..k arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.

A187462

T(n,k)=Number of (n+1)X(n+1) 0..k arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.

Terms

    a(0) =6a(1) =50a(2) =26a(3) =192a(4) =1236a(5) =144a(6) =512a(7) =13726a(8) =89618a(9) =1272a(10) =1126a(11) =84048a(12) =5098224a(13) =11684688a(14) =15192a(15) =2146a(16) =325932a(17) =100936174a(18) =3387715318a(19) =6112320620a(20) =286392a(21) =3760a(22) =1118854a(23) =1061948616a(24) =216668424092a(27) =7648032a(28) =6112

External references