T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three exactly once.
A269186
T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three exactly once.
Terms
- a(0) =0a(1) =4a(2) =4a(3) =24a(4) =48a(5) =24a(6) =108a(7) =384a(8) =384a(9) =108a(10) =432a(11) =2736a(12) =5888a(13) =2736a(14) =432a(15) =1620a(16) =18336a(17) =80112a(18) =80112a(19) =18336a(20) =1620a(21) =5832a(22) =118032a(23) =1031344a(24) =2097552a(25) =1031344a(26) =118032a(27) =5832a(28) =20412a(29) =739008
External references
- oeis: A269186