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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.

A002067 a(n) = Sum_{k=0..n-1} binomial(2*n,2*k)*a(k)*a(n-k-1).

Table of values

n a(n)
0 1
1 1
2 7
3 127
4 4369
5 243649
6 20036983
7 2280356863
8 343141433761
9 65967241200001
10 15773461423793767
11 4591227123230945407
12 1598351733247609852849
13 655782249799531714375489
14 313160404864973852338669783
15 172201668512657346455126457343
16 108026349476762041127839800617281

List of values

[1, 1, 7, 127, 4369, 243649, 20036983, 2280356863, 343141433761, 65967241200001, 15773461423793767, 4591227123230945407, 1598351733247609852849, 655782249799531714375489, 313160404864973852338669783, 172201668512657346455126457343, 108026349476762041127839800617281]

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

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