Number of 0..4 arrays of length n with no adjacent pair equal to its immediately preceding adjacent pair, and new values introduced in 0..4 order.
A212825
Number of 0..4 arrays of length n with no adjacent pair equal to its immediately preceding adjacent pair, and new values introduced in 0..4 order.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =44a(5) =167a(6) =695a(7) =3070a(8) =14074a(9) =65958a(10) =313098a(11) =1497216a(12) =7189646a(13) =34606966a(14) =166803484a(15) =804596882a(16) =3882748894a(17) =18741593296a(18) =90476092366a(19) =436812623774
External references
- oeis: A212825