Number of n X 2 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1 or 3 1s.
A295247
Number of n X 2 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1 or 3 1s.
Terms
- a(0) =4a(1) =11a(2) =35a(3) =106a(4) =327a(5) =1003a(6) =3082a(7) =9465a(8) =29073a(9) =89296a(10) =274273a(11) =842425a(12) =2587500a(13) =7947475a(14) =24410579a(15) =74976810a(16) =230290407a(17) =707334323a(18) =2172569202a(19) =6673021201a(20) =20496107521a(21) =62953557440a(22) =193361124321a(23) =593906459281
External references
- oeis: A295247