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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A261784 Number of compositions of 2n where each part i is marked with a word of length i over an n-ary alphabet whose letters appear in alphabetical order and all n letters occur at least once in the composition.

Table of values

n a(n)
0 1
1 2
2 66
3 5546
4 893490
5 235804122
6 92540869002
7 50592275219138
8 36763980389367378
9 34277110454602760762
10 39890088439337327537706
11 56678337951284473917309346
12 96562013312452672907356749786
13 194303876852797223949281552591106
14 455927121076167354458618221923117282

List of values

[1, 2, 66, 5546, 893490, 235804122, 92540869002, 50592275219138, 36763980389367378, 34277110454602760762, 39890088439337327537706, 56678337951284473917309346, 96562013312452672907356749786, 194303876852797223949281552591106, 455927121076167354458618221923117282]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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