Number of 2 X n binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

A268996

Number of 2 X n binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

Terms

    a(0) =4a(1) =13a(2) =35a(3) =103a(4) =278a(5) =763a(6) =2037a(7) =5421a(8) =14264a(9) =37321a(10) =97015a(11) =250963a(12) =646250a(13) =1657719a(14) =4237481a(15) =10798553a(16) =27442092a(17) =69563653a(18) =175938699a(19) =444060607a(20) =1118668286a(21) =2813233523a(22) =7063416349a(23) =17708464645a(24) =44335423456a(25) =110857865665a(26) =276863340767

External references