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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.

A372499 G.f. satisfies A(A(A(x))) = F(x), where F(x) is the g.f. for A053540(n) = n*9^(n-1).

Table of values

n a(n)
0 0
1 1
2 6
3 9
4 54
5 0
6 -1944
7 44469
8 -323676
9 -5990193
10 179194032
11 484654509
12 -105337511100
13 757846026261
14 85419734244300
15 -1707846638480514
16 -90276038133498612
17 3464956887464464164
18 118426852966952180502
19 -7984363576091338944720
20 -181143285020960488524558

List of values

[0, 1, 6, 9, 54, 0, -1944, 44469, -323676, -5990193, 179194032, 484654509, -105337511100, 757846026261, 85419734244300, -1707846638480514, -90276038133498612, 3464956887464464164, 118426852966952180502, -7984363576091338944720, -181143285020960488524558]

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

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