Number of nX7 0..1 arrays with every element unequal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318422
Number of nX7 0..1 arrays with every element unequal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =23a(2) =9a(3) =225a(4) =839a(5) =2489a(6) =11802a(7) =45560a(8) =190929a(9) =738777a(10) =2951001a(11) =11787988a(12) =47807984a(13) =192301338a(14) =774415325a(15) =3108883286a(16) =12511830132a(17) =50334154452a(18) =202614148901a(19) =815213327373
External references
- oeis: A318422