Number of n X 3 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

A268761

Number of n X 3 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

Terms

    a(0) =2a(1) =15a(2) =56a(3) =223a(4) =762a(5) =2607a(6) =8500a(7) =27411a(8) =86622a(9) =270955a(10) =838224a(11) =2573015a(12) =7841538a(13) =23759463a(14) =71619436a(15) =214933915a(16) =642504870a(17) =1914023267a(18) =5684288136a(19) =16834582623a(20) =49732758858a(21) =146587890015a(22) =431177727396

External references