Number of n X 3 binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.

A268735

Number of n X 3 binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.

Terms

    a(0) =2a(1) =15a(2) =80a(3) =396a(4) =1788a(5) =7831a(6) =33170a(7) =137868a(8) =563486a(9) =2275119a(10) =9091772a(11) =36031648a(12) =141793168a(13) =554669335a(14) =2158604934a(15) =8363066408a(16) =32273565050a(17) =124112115647a(18) =475807505288

External references