T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once.
A269143
T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once.
Terms
- a(0) =4a(1) =16a(2) =16a(3) =60a(4) =148a(5) =60a(6) =216a(7) =1164a(8) =1164a(9) =216a(10) =756a(11) =8532a(12) =18556a(13) =8532a(14) =756a(15) =2592a(16) =59916a(17) =275796a(18) =275796a(19) =59916a(20) =2592a(21) =8748a(22) =408596a(23) =3924212a(24) =8317996a(25) =3924212a(26) =408596a(27) =8748a(28) =29160a(29) =2727564
External references
- oeis: A269143