Number of n-length words w over 6-ary alphabet such that for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z.
A213294
Number of n-length words w over 6-ary alphabet such that for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z.
Terms
- a(0) =1a(1) =6a(2) =36a(3) =171a(4) =711a(5) =2506a(6) =8151a(7) =25781a(8) =83728a(9) =273248a(10) =916966a(11) =3121506a(12) =10934875a(13) =38945256a(14) =142403783a(15) =529393936a(16) =2014819829a(17) =7790840332a(18) =30758499541a(19) =123255094820a(20) =503078455794
External references
- oeis: A213294