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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.

A345104 a(n) = 1 + 2 * Sum_{k=0..n-1} binomial(n-1,k) * a(k) * a(n-k-1).

Table of values

n a(n)
0 1
1 3
2 13
3 89
4 825
5 9601
6 134185
7 2188353
8 40788745
9 855303265
10 19927758377
11 510728051073
12 14279388168137
13 432505475357729
14 14107767947949289
15 493046896702987841
16 18380057918926012809
17 728005164671113691105
18 30531323352522247757225
19 1351567976217998536472833

List of values

[1, 3, 13, 89, 825, 9601, 134185, 2188353, 40788745, 855303265, 19927758377, 510728051073, 14279388168137, 432505475357729, 14107767947949289, 493046896702987841, 18380057918926012809, 728005164671113691105, 30531323352522247757225, 1351567976217998536472833]

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

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