Number of 2 X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

A269012

Number of 2 X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

Terms

    a(0) =0a(1) =4a(2) =8a(3) =36a(4) =88a(5) =272a(6) =696a(7) =1900a(8) =4856a(9) =12588a(10) =31792a(11) =80288a(12) =200304a(13) =498004a(14) =1229672a(15) =3024948a(16) =7407496a(17) =18079664a(18) =43980072a(19) =106688956a(20) =258132824a(21) =623113020a(22) =1500935776a(23) =3608439104a(24) =8659683552a(25) =20747930788a(26) =49635222728a(27) =118576046148

External references