Number of 4-length words w over n-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.
A213283
Number of 4-length words w over n-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) =0a(1) =1a(2) =9a(3) =36a(4) =118a(5) =315a(6) =711a(7) =1414a(8) =2556a(9) =4293a(10) =6805a(11) =10296a(12) =14994a(13) =21151a(14) =29043a(15) =38970a(16) =51256a(17) =66249a(18) =84321a(19) =105868a(20) =131310a(21) =161091a(22) =195679a(23) =235566a(24) =281268a(25) =333325a(26) =392301a(27) =458784a(28) =533386a(29) =616743
External references
- oeis: A213283