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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.

A303927 G.f. A(x) satisfies: 1 = Sum_{n>=0} ( (1 + x*A(x)^2)^n - A(x) )^n.

Table of values

n a(n)
0 1
1 1
2 3
3 19
4 199
5 2863
6 51280
7 1087107
8 26492959
9 728234294
10 22273547313
11 750180870861
12 27591387247199
13 1100527782602563
14 47324815446060104
15 2182852921566858499
16 107515416285928793865
17 5632697086212688424650
18 312779421789041421062682
19 18351511395587408908636348
20 1134459736825581425674735933

List of values

[1, 1, 3, 19, 199, 2863, 51280, 1087107, 26492959, 728234294, 22273547313, 750180870861, 27591387247199, 1100527782602563, 47324815446060104, 2182852921566858499, 107515416285928793865, 5632697086212688424650, 312779421789041421062682, 18351511395587408908636348, 1134459736825581425674735933]

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

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