T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.

A205215

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards.

Terms

    a(0) =81a(1) =452a(2) =452a(3) =1970a(4) =3248a(5) =1970a(6) =8128a(7) =23578a(8) =23578a(9) =8128a(10) =33386a(11) =203313a(12) =357812a(13) =203313a(14) =33386a(15) =139390a(16) =1846145a(17) =5500266a(18) =5500266a(19) =1846145a(20) =139390a(21) =588254a(22) =17014174a(23) =82656765a(24) =155765726a(25) =82656765a(26) =17014174a(27) =588254a(28) =2496440a(29) =157776973

External references