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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.

A358368 a(n) = Sum_{k=0..n} C(n)^2 * binomial(n + k, k), where C(n) is the n-th Catalan number.

Table of values

n a(n)
0 1
1 3
2 40
3 875
4 24696
5 814968
6 29899584
7 1184303835
8 49711519000
9 2183727606632
10 99503164453056
11 4672502764108088
12 225011739846443200
13 11070183993903000000
14 554749060302467136000
15 28247778810831290434875
16 1458696209123375067879000
17 76266400563425844598365000

List of values

[1, 3, 40, 875, 24696, 814968, 29899584, 1184303835, 49711519000, 2183727606632, 99503164453056, 4672502764108088, 225011739846443200, 11070183993903000000, 554749060302467136000, 28247778810831290434875, 1458696209123375067879000, 76266400563425844598365000]

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

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