T(n,k)=Number of nXk (-1,0,1) arrays of determinants of 2X2 subblocks of some (n+1)X(k+1) binary array.

A226717

T(n,k)=Number of nXk (-1,0,1) arrays of determinants of 2X2 subblocks of some (n+1)X(k+1) binary array.

Terms

    a(0) =3a(1) =9a(2) =9a(3) =25a(4) =71a(5) =25a(6) =67a(7) =427a(8) =427a(9) =67a(10) =181a(11) =2393a(12) =4671a(13) =2393a(14) =181a(15) =491a(16) =13691a(17) =49019a(18) =49019a(19) =13691a(20) =491a(21) =1331a(22) =80043a(23) =539703a(24) =977939a(25) =539703a(26) =80043a(27) =1331a(28) =3607a(29) =469273

External references