cp's OEIS Frontend

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.

A349581 G.f. A(x) satisfies: A(x) = 1 / (1 - 2*x) + x * (1 - 2*x)^2 * A(x)^4.

Table of values

n a(n)
0 1
1 3
2 12
3 66
4 460
5 3681
6 31848
7 289176
8 2714044
9 26103468
10 255876048
11 2546717454
12 25666830724
13 261407935366
14 2686191839232
15 27815564456544
16 289960011573212
17 3040424427011492
18 32046741183678288
19 339345854532800136
20 3608307717155678256
21 38511520730570169033

List of values

[1, 3, 12, 66, 460, 3681, 31848, 289176, 2714044, 26103468, 255876048, 2546717454, 25666830724, 261407935366, 2686191839232, 27815564456544, 289960011573212, 3040424427011492, 32046741183678288, 339345854532800136, 3608307717155678256, 38511520730570169033]