Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 2 or 3 neighboring 1s.
A297638
Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 2 or 3 neighboring 1s.
Terms
- a(0) =4a(1) =8a(2) =29a(3) =69a(4) =200a(5) =552a(6) =1641a(7) =4685a(8) =13716a(9) =40248a(10) =119365a(11) =353541a(12) =1051472a(13) =3133592a(14) =9358769a(15) =27971501a(16) =83684604a(17) =250541896a(18) =750515501a(19) =2248981061a(20) =6741211928a(21) =20210867784a(22) =60604323641a(23) =181749073613a(24) =545104106532
External references
- oeis: A297638