Number of n X 2 0..1 arrays with each 1 adjacent to 0, 2 or 3 king-move neighboring 1s.

A296668

Number of n X 2 0..1 arrays with each 1 adjacent to 0, 2 or 3 king-move neighboring 1s.

Terms

    a(0) =3a(1) =10a(2) =25a(3) =68a(4) =208a(5) =609a(6) =1785a(7) =5375a(8) =16174a(9) =48589a(10) =146652a(11) =443220a(12) =1339225a(13) =4049457a(14) =12250187a(15) =37060306a(16) =112130705a(17) =339304900a(18) =1026763976a(19) =3107142321a(20) =9402919993a(21) =28455721175a(22) =86115053750a(23) =260609950693a(24) =788686494268

External references