Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.
A227640
Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.
Terms
- a(0) =5a(1) =44a(2) =377a(3) =3202a(4) =25241a(5) =179234a(6) =1147095a(7) =6679750a(8) =35730988a(9) =177168580a(10) =820755334a(11) =3576675995a(12) =14747597428a(13) =57825369396a(14) =216544923909a(15) =777378404391
External references
- oeis: A227640