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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.

A328006 Expansion of e.g.f. 1 / (1 - Sum_{k>=1} binomial(2*k,k) * x^k / (k + 1)!).

Table of values

n a(n)
0 1
1 1
2 4
3 23
4 174
5 1642
6 18596
7 245737
8 3711294
9 63056858
10 1190408544
11 24720216578
12 560011664724
13 13743710272060
14 363241612472368
15 10286092411744025
16 310694791014710206
17 9971177817032175594
18 338830529059491098336
19 12153453467291303419246
20 458873804279349884222364

List of values

[1, 1, 4, 23, 174, 1642, 18596, 245737, 3711294, 63056858, 1190408544, 24720216578, 560011664724, 13743710272060, 363241612472368, 10286092411744025, 310694791014710206, 9971177817032175594, 338830529059491098336, 12153453467291303419246, 458873804279349884222364]