T(n,k)=Number of nXk 0..5 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling five exactly once.

A269888

T(n,k)=Number of nXk 0..5 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling five exactly once.

Terms

    a(0) =0a(1) =6a(2) =6a(3) =60a(4) =432a(5) =60a(6) =450a(7) =11280a(8) =11280a(9) =450a(10) =3000a(11) =250992a(12) =943488a(13) =250992a(14) =3000a(15) =18750a(16) =5125008a(17) =68182800a(18) =68182800a(19) =5125008a(20) =18750a(21) =112500a(22) =99482544a(23) =4546948272a(24) =16086672048a(25) =4546948272a(26) =99482544a(27) =112500a(28) =656250a(29) =1867222224

External references