Number of 2 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 2 neighboring 1s.

A297507

Number of 2 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Terms

    a(0) =1a(1) =10a(2) =31a(3) =68a(4) =218a(5) =729a(6) =2097a(7) =6139a(8) =18932a(9) =57273a(10) =170792a(11) =514608a(12) =1554993a(13) =4677797a(14) =14071941a(15) =42401182a(16) =127713015a(17) =384477424a(18) =1157762858a(19) =3486768241a(20) =10499588277a(21) =31616525407a(22) =95208917296a(23) =286707283257a(24) =863361068252

External references