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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.

A180254 E.g.f. A(x) satisfies: A'(x) = (1 - sqrt(1-4*A(x))) / (2*A(x)).

Table of values

n a(n)
1 1
2 1
3 5
4 47
5 655
6 12145
7 281645
8 7848575
9 255581095
10 9527142625
11 400145871125
12 18700514207375
13 962618343061375
14 54121350164907025
15 3300097924150152125
16 216926019220561025375
17 15292057853288541700375
18 1150861860384703732890625
19 92099021113080260667513125

List of values

[1, 1, 5, 47, 655, 12145, 281645, 7848575, 255581095, 9527142625, 400145871125, 18700514207375, 962618343061375, 54121350164907025, 3300097924150152125, 216926019220561025375, 15292057853288541700375, 1150861860384703732890625, 92099021113080260667513125]

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

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