Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.

A227638

Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having determinant equal to one, with rows and columns of the latter in nondecreasing lexicographic order.

Terms

    a(0) =3a(1) =11a(2) =39a(3) =127a(4) =377a(5) =1014a(6) =2518a(7) =5844a(8) =12790a(9) =26582a(10) =52769a(11) =100547a(12) =184661a(13) =328068a(14) =565582a(15) =948764a(16) =1552366a(17) =2482688a(18) =3888261a(19) =5973327a(20) =9014649a(21) =13382250a(22) =19564750a(23) =28200044a(24) =40112142a(25) =56355074a(26) =78264849a(27) =107520547a(28) =146215717a(29) =196941352

External references