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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.

A208881 Number of words either empty or beginning with the first letter of the ternary alphabet, where each letter of the alphabet occurs n times.

Table of values

n a(n)
0 1
1 2
2 30
3 560
4 11550
5 252252
6 5717712
7 133024320
8 3155170590
9 75957810500
10 1850332263780
11 45508998487680
12 1128243920840400
13 28159366024288800
14 706857555303576000
15 17831659928458210560
16 451781821468671694110
17 11489952898943726476500
18 293206575828601020085500

List of values

[1, 2, 30, 560, 11550, 252252, 5717712, 133024320, 3155170590, 75957810500, 1850332263780, 45508998487680, 1128243920840400, 28159366024288800, 706857555303576000, 17831659928458210560, 451781821468671694110, 11489952898943726476500, 293206575828601020085500]

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

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