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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.

A273925 G.f. satisfies: A( A(x)^2 - A(x)^3 ) = x^2, where A(x) = Sum_{n>=1} a(n)*x^n / 2^A273926(n).

Table of values

n a(n)
1 1
2 1
3 3
4 3
5 175
6 41
7 4947
8 321
9 687611
10 11403
11 25132181
12 107305
13 1941554203
14 2111325
15 77643067507
16 21427329
17 25549683166419
18 1782548851
19 1073363084982753
20 18891311061
21 91744420207896017
22 406630578535
23 3975787925128277349
24 4432136534071
25 697211573846047770799
26 195301983407647
27 30867311449650538783337
28 2171049926840877
29 2756162894749311377078579
30 48645967088000101

List of values

[1, 1, 3, 3, 175, 41, 4947, 321, 687611, 11403, 25132181, 107305, 1941554203, 2111325, 77643067507, 21427329, 25549683166419, 1782548851, 1073363084982753, 18891311061, 91744420207896017, 406630578535, 3975787925128277349, 4432136534071, 697211573846047770799, 195301983407647, 30867311449650538783337, 2171049926840877, 2756162894749311377078579, 48645967088000101]

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

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