T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three no more than once.

A269194

T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three no more than once.

Terms

    a(0) =4a(1) =16a(2) =16a(3) =60a(4) =108a(5) =60a(6) =216a(7) =708a(8) =708a(9) =216a(10) =756a(11) =4476a(12) =9284a(13) =4476a(14) =756a(15) =2592a(16) =27684a(17) =115452a(18) =115452a(19) =27684a(20) =2592a(21) =8748a(22) =168252a(23) =1399612a(24) =2817548a(25) =1399612a(26) =168252a(27) =8748a(28) =29160a(29) =1008804

External references