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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.

A380678 G.f. A(x) satisfies A( x - A(x)^2/(1 - A(x)^2) ) = x.

Table of values

n a(n)
1 1
2 1
3 4
4 25
5 190
6 1645
7 15652
8 160186
9 1739032
10 19838179
11 236192158
12 2920269202
13 37352521348
14 492799406899
15 6690428699026
16 93293086422514
17 1334088426585850
18 19538994465481000
19 292775222237716612
20 4484180296611470218
21 70146488080451823382
22 1119964903188050808163
23 18239593214541431577550

List of values

[1, 1, 4, 25, 190, 1645, 15652, 160186, 1739032, 19838179, 236192158, 2920269202, 37352521348, 492799406899, 6690428699026, 93293086422514, 1334088426585850, 19538994465481000, 292775222237716612, 4484180296611470218, 70146488080451823382, 1119964903188050808163, 18239593214541431577550]

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

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