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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.

A385444 Expansion of e.g.f. (1/x) * Series_Reversion( x/(4*x + sqrt(16*x^2+1))^(1/4) ).

Table of values

n a(n)
0 1
1 1
2 3
3 0
4 -195
5 -2160
6 21735
7 1290240
8 13253625
9 -758419200
10 -34777667925
11 0
12 59136015863925
13 2148944878080000
14 -60019159896320625
15 -8741374232887296000
16 -200253365886518319375
17 23678097149478739968000
18 2107410008390562322321875
19 0
20 -11628675802354427876266081875

List of values

[1, 1, 3, 0, -195, -2160, 21735, 1290240, 13253625, -758419200, -34777667925, 0, 59136015863925, 2148944878080000, -60019159896320625, -8741374232887296000, -200253365886518319375, 23678097149478739968000, 2107410008390562322321875, 0, -11628675802354427876266081875]

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