Number of nX3 (0,1,2) arrays of permanents of 2X2 subblocks of some (n+1)X4 binary array with rows and columns of the latter in lexicographically nondecreasing order.
A227022
Number of nX3 (0,1,2) arrays of permanents of 2X2 subblocks of some (n+1)X4 binary array with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =12a(1) =72a(2) =335a(3) =1366a(4) =4948a(5) =16115a(6) =47659a(7) =129463a(8) =326522a(9) =771653a(10) =1722005a(11) =3652726a(12) =7406710a(13) =14426468a(14) =27103102a(15) =49288384a(16) =87029344a(17) =149600861a(18) =250930856a(19) =411535151a(20) =661105246a(21) =1041922558a(22) =1613307461a(23) =2457351181a(24) =3686223670
External references
- oeis: A227022