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.

A215117 G.f. A(x) satisfies: A(A(A(A(x)))) = G(x) where G(x) = x + 3*x^2 + x*G(G(G(G(x)))) is the g.f. of A215116.

Table of values

n a(n)
1 1
2 1
3 1
4 49
5 721
6 17281
7 452065
8 13511953
9 443435185
10 15816390241
11 606861668161
12 24867738772849
13 1082158542264721
14 49785517156216897
15 2412544311495241633
16 122762020478952148177
17 6542028190536528941425
18 364254737003651267997985
19 21146448814786605196994305

List of values

[1, 1, 1, 49, 721, 17281, 452065, 13511953, 443435185, 15816390241, 606861668161, 24867738772849, 1082158542264721, 49785517156216897, 2412544311495241633, 122762020478952148177, 6542028190536528941425, 364254737003651267997985, 21146448814786605196994305]

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

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