Number of n X 3 binary arrays with every 1 having exactly two king-move neighbors equal to 1.

A183444

Number of n X 3 binary arrays with every 1 having exactly two king-move neighbors equal to 1.

Terms

    a(0) =1a(1) =9a(2) =18a(3) =30a(4) =107a(5) =265a(6) =553a(7) =1505a(8) =3852a(9) =8922a(10) =22477a(11) =56889a(12) =137617a(13) =340401a(14) =851098a(15) =2091618a(16) =5160851a(17) =12817517a(18) =31655009a(19) =78159377a(20) =193558964a(21) =478614470a(22) =1182673261a(23) =2925763109a(24) =7235864705a(25) =17887850273a(26) =44237338898a(27) =109401520982

External references