Number of n-length words w over a 5-ary alphabet such that w is empty or a prefix z concatenated with letter a_i and i=1 or 0 < #(z,a_{i-1}) >= #(z,a_i), where #(z,a_i) counts the occurrences of the i-th letter in z.
A240611
Number of n-length words w over a 5-ary alphabet such that w is empty or a prefix z concatenated with letter a_i and i=1 or 0 < #(z,a_{i-1}) >= #(z,a_i), where #(z,a_i) counts the occurrences of the i-th letter in z.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =46a(6) =164a(7) =629a(8) =2511a(9) =10284a(10) =42765a(11) =179411a(12) =757518a(13) =3212026a(14) =13672821a(15) =58390509a(16) =250183486a(17) =1075280768a(18) =4636221163a(19) =20051763960a(20) =86995226538a(21) =378588153837
External references
- oeis: A240611