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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.

A211611 a(n) = Sum_{k=1..n-1} C(k)^n, where C(k) is a Catalan number.

Table of values

n a(n)
2 1
3 9
4 642
5 540982
6 5496576970
7 698491214560174
8 1147342896257677900291
9 25005346993500437111980892595
10 7381619397278667883874693730628586499
11 30009934325456999669083059570156145437948880627
12 1703283943023520710008632777768663744247664926649672215939

List of values

[1, 9, 642, 540982, 5496576970, 698491214560174, 1147342896257677900291, 25005346993500437111980892595, 7381619397278667883874693730628586499, 30009934325456999669083059570156145437948880627, 1703283943023520710008632777768663744247664926649672215939]

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

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