T(n,k)=Number of nXk 0..4 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling four exactly once.

A269829

T(n,k)=Number of nXk 0..4 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling four exactly once.

Terms

    a(0) =0a(1) =5a(2) =5a(3) =40a(4) =216a(5) =40a(6) =240a(7) =3096a(8) =3096a(9) =240a(10) =1280a(11) =39784a(12) =103296a(13) =39784a(14) =1280a(15) =6400a(16) =462680a(17) =3200604a(18) =3200604a(19) =462680a(20) =6400a(21) =30720a(22) =5145736a(23) =90748696a(24) =240637408a(25) =90748696a(26) =5145736a(27) =30720a(28) =143360a(29) =55265336

External references