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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.

A246861 G.f. satisfies: A(x) = Sum_{n>=0} x^n * Sum_{k=0..n} C(n,k)^2 * (x*A(x))^(2*k).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 7
5 21
6 54
7 141
8 407
9 1231
10 3691
11 10990
12 33144
13 101674
14 314679
15 977289
16 3047527
17 9557503
18 30133759
19 95390622
20 302960929
21 965282651
22 3085146472
23 9888455045
24 31774215928
25 102334358736
26 330298415136
27 1068242904256
28 3461372341327
29 11235251353747
30 36527859658661

List of values

[1, 1, 1, 2, 7, 21, 54, 141, 407, 1231, 3691, 10990, 33144, 101674, 314679, 977289, 3047527, 9557503, 30133759, 95390622, 302960929, 965282651, 3085146472, 9888455045, 31774215928, 102334358736, 330298415136, 1068242904256, 3461372341327, 11235251353747, 36527859658661]

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