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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.

A121012 Numerators of partial alternating sums of Catalan numbers scaled by powers of 1/(11^2) = 1/121.

Table of values

n a(n)
0 1
1 120
2 14522
3 1757157
4 212616011
5 25726537289
6 282991910191
7 34242021133072
8 4143284557101842
9 501337431409322440
10 667280121205808184436
11 80740894665902790257970
12 9769648254574237621422382

List of values

[1, 120, 14522, 1757157, 212616011, 25726537289, 282991910191, 34242021133072, 4143284557101842, 501337431409322440, 667280121205808184436, 80740894665902790257970, 9769648254574237621422382]

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

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