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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.

A371494 G.f. A(x) satisfies A(x) = 1 / (1 - x*A(x) / (1+x))^2.

Table of values

n a(n)
0 1
1 2
2 5
3 18
4 72
5 310
6 1399
7 6532
8 31287
9 152876
10 759034
11 3818410
12 19420713
13 99697784
14 515909606
15 2688267462
16 14093211259
17 74281217492
18 393389969722
19 2092312452404
20 11171325560120
21 59854910468196
22 321717833732186
23 1734250394445622
24 9373581927760595

List of values

[1, 2, 5, 18, 72, 310, 1399, 6532, 31287, 152876, 759034, 3818410, 19420713, 99697784, 515909606, 2688267462, 14093211259, 74281217492, 393389969722, 2092312452404, 11171325560120, 59854910468196, 321717833732186, 1734250394445622, 9373581927760595]

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

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