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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.

A233895 G.f. satisfies: A(x) = 1 + x*A(x)*A(-x) + x^2*(A(x)^2 + A(-x)^2).

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 10
5 18
6 60
7 115
8 410
9 822
10 2996
11 6174
12 22980
13 48324
14 182328
15 389187
16 1484410
17 3205710
18 12329988
19 26876586
20 104080812
21 228606012
22 890262984
23 1967830254
24 7699472676
25 17110322908
26 67215426440
27 150058534620
28 591517612616
29 1325828841480
30 5241992235888

List of values

[1, 1, 2, 3, 10, 18, 60, 115, 410, 822, 2996, 6174, 22980, 48324, 182328, 389187, 1484410, 3205710, 12329988, 26876586, 104080812, 228606012, 890262984, 1967830254, 7699472676, 17110322908, 67215426440, 150058534620, 591517612616, 1325828841480, 5241992235888]

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

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