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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.

A345102 a(n) = 1 + 3 * Sum_{k=0..n-1} binomial(n,k) * a(k) * a(n-k-1).

Table of values

n a(n)
0 1
1 4
2 37
3 589
4 13276
5 386059
6 13741057
7 578451514
8 28109736811
9 1548565036789
10 95365652263102
11 6492034471389889
12 484086370908869821
13 39238367740327468444
14 3435176518078688461297
15 323029539924876486293089
16 32472511993953383052630556
17 3475005417300807667690138399

List of values

[1, 4, 37, 589, 13276, 386059, 13741057, 578451514, 28109736811, 1548565036789, 95365652263102, 6492034471389889, 484086370908869821, 39238367740327468444, 3435176518078688461297, 323029539924876486293089, 32472511993953383052630556, 3475005417300807667690138399]

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

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