Number of n X 3 0..2 arrays with every 1 immediately preceded by 0 to the left or above, no 0 immediately preceded by a 0, and every 2 immediately preceded by 0 1 to the left or above.
A203176
Number of n X 3 0..2 arrays with every 1 immediately preceded by 0 to the left or above, no 0 immediately preceded by a 0, and every 2 immediately preceded by 0 1 to the left or above.
Terms
- a(0) =2a(1) =2a(2) =7a(3) =17a(4) =41a(5) =97a(6) =235a(7) =607a(8) =1415a(9) =3486a(10) =8648a(11) =20838a(12) =51170a(13) =124939a(14) =305270a(15) =746199a(16) =1820662a(17) =4454559a(18) =10877169a(19) =26569604a(20) =64944236a(21) =158629072a(22) =387600053a(23) =946993492a(24) =2313654220a(25) =5653010591a(26) =13810992779a(27) =33744134975a(28) =82444452049
External references
- oeis: A203176