942172

Appears in sequences

• Partial sums of A051879.at n=18A050405
• G.f.: 1/((1-x^2)^3*(1-x)^4).at n=37A060099
• Number T(n,k) of length 3n words such that all letters of the k-ary alphabet occur at least once and are introduced in ascending order and which can be built by repeatedly inserting triples of identical letters into the initially empty word; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=43A256311
• Number of words of length 3n such that all letters of the septenary alphabet occur at least once and are introduced in ascending order and which can be built by repeatedly inserting triples of identical letters into the initially empty word.at n=1A321037