T(n,k)=Number of nXk 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

A268628

T(n,k)=Number of nXk 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

Terms

    a(0) =3a(1) =9a(2) =9a(3) =24a(4) =42a(5) =24a(6) =60a(7) =174a(8) =174a(9) =60a(10) =144a(11) =666a(12) =1086a(13) =666a(14) =144a(15) =336a(16) =2430a(17) =6300a(18) =6300a(19) =2430a(20) =336a(21) =768a(22) =8586a(23) =34890a(24) =55452a(25) =34890a(26) =8586a(27) =768a(28) =1728a(29) =29646

External references