T(n,k)=Number of nXk 0..4 arrays of sums of 2X2 subblocks of some (n+1)X(k+1) binary array with rows and columns of the latter in lexicographically nondecreasing order.

A226992

T(n,k)=Number of nXk 0..4 arrays of sums of 2X2 subblocks of some (n+1)X(k+1) binary array with rows and columns of the latter in lexicographically nondecreasing order.

Terms

    a(0) =5a(1) =10a(2) =10a(3) =15a(4) =42a(5) =15a(6) =21a(7) =120a(8) =120a(9) =21a(10) =28a(11) =313a(12) =608a(13) =313a(14) =28a(15) =36a(16) =729a(17) =2820a(18) =2820a(19) =729a(20) =36a(21) =45a(22) =1556a(23) =11325a(24) =24158a(25) =11325a(26) =1556a(27) =45a(28) =55a(29) =3099

External references