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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.

A385835 a(n) = 1 + Sum_{k=0..n-1} (1 + k^2) * a(k) * a(n-1-k).

Table of values

n a(n)
0 1
1 2
2 7
3 51
4 660
5 13350
6 390886
7 15728919
8 836469748
9 56989647229
10 4849599126797
11 504709937298467
12 63117270187248665
13 9344222191368190761
14 1616899887657388367640
15 323430766605746093449465
16 74074314477265886578774322
17 19261037812212680097678843345
18 5643873902659784713257894768422

List of values

[1, 2, 7, 51, 660, 13350, 390886, 15728919, 836469748, 56989647229, 4849599126797, 504709937298467, 63117270187248665, 9344222191368190761, 1616899887657388367640, 323430766605746093449465, 74074314477265886578774322, 19261037812212680097678843345, 5643873902659784713257894768422]

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

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