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.

A215119 G.f. A(x) satisfies: A(A(A(A(A(x))))) = G(x) where G(x) = x + 4*x^2 + x*G(G(G(G(G(x))))) is the g.f. of A215118.

Table of values

n a(n)
1 1
2 1
3 1
4 101
5 2301
6 82601
7 3287001
8 149411501
9 7474902101
10 406765054801
11 23836604715601
12 1493376284080501
13 99459838574595501
14 7009748111184956601
15 520845172037612209801
16 40672220108202107951101
17 3328819620490715884626501
18 284871268231239093741932001

List of values

[1, 1, 1, 101, 2301, 82601, 3287001, 149411501, 7474902101, 406765054801, 23836604715601, 1493376284080501, 99459838574595501, 7009748111184956601, 520845172037612209801, 40672220108202107951101, 3328819620490715884626501, 284871268231239093741932001]

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

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