T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.

A269276

T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.

Terms

    a(0) =0a(1) =4a(2) =0a(3) =24a(4) =108a(5) =0a(6) =108a(7) =1368a(8) =1620a(9) =0a(10) =432a(11) =13896a(12) =46872a(13) =20412a(14) =0a(15) =1620a(16) =127512a(17) =1104264a(18) =1365336a(19) =236196a(20) =0a(21) =5832a(22) =1104264a(23) =23549400a(24) =74853576a(25) =36673560a(26) =2598156a(27) =0a(28) =20412a(29) =9211608

External references