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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.

A386299 a(n) = 1 + Sum_{k=0..n-1} 3^k * binomial(n-1,k) * a(k) * a(n-1-k).

Table of values

n a(n)
0 1
1 2
2 9
3 115
4 3869
5 349233
6 88835413
7 65934937157
8 145194342935565
9 955092851917410169
10 18817250316042492760133
11 1111535058740789497290819885
12 196930668231818953760620540315069
13 104661954649505883286587026252584631249
14 166867787421063078832424708621648215185207669

List of values

[1, 2, 9, 115, 3869, 349233, 88835413, 65934937157, 145194342935565, 955092851917410169, 18817250316042492760133, 1111535058740789497290819885, 196930668231818953760620540315069, 104661954649505883286587026252584631249, 166867787421063078832424708621648215185207669]

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

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