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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.

A143523 a(n) = n-fold Dumont operator of x evaluated at x=y=1, z=3.

Table of values

n a(n)
0 1
1 3
2 10
3 42
4 248
5 1992
6 19600
7 222288
8 2851712
9 41075328
10 658359040
11 11621260032
12 223832419328
13 4669549335552
14 104894256056320
15 2524539033397248
16 64811332658757632
17 1767891945806266368
18 51060500413513400320

List of values

[1, 3, 10, 42, 248, 1992, 19600, 222288, 2851712, 41075328, 658359040, 11621260032, 223832419328, 4669549335552, 104894256056320, 2524539033397248, 64811332658757632, 1767891945806266368, 51060500413513400320]

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

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