Number of n X 3 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

A297219

Number of n X 3 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s.

Terms

    a(0) =3a(1) =8a(2) =24a(3) =68a(4) =196a(5) =564a(6) =1620a(7) =4660a(8) =13396a(9) =38516a(10) =110740a(11) =318388a(12) =915412a(13) =2631924a(14) =7567124a(15) =21756468a(16) =62552660a(17) =179847028a(18) =517083540a(19) =1486682292a(20) =4274404564a(21) =12289467892a(22) =35333815316a(23) =101589305140a(24) =292082437972a(25) =839774919796

External references