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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.

A372492 G.f. satisfies A(A(A(A(x)))) = F(x), where F(x) is the g.f. for A002697(n) = n*4^(n-1).

Table of values

n a(n)
0 0
1 1
2 2
3 0
4 4
5 -8
6 -8
7 288
8 -1712
9 -1888
10 105472
11 -288576
12 -10404800
13 84940672
14 1454871936
15 -24372060160
16 -255228956416
17 8232158755328
18 49829958005760
19 -3390379506089984
20 -7038865141000192
21 1699612131395493888
22 -3459036721655810048
23 -1025681798088053424128

List of values

[0, 1, 2, 0, 4, -8, -8, 288, -1712, -1888, 105472, -288576, -10404800, 84940672, 1454871936, -24372060160, -255228956416, 8232158755328, 49829958005760, -3390379506089984, -7038865141000192, 1699612131395493888, -3459036721655810048, -1025681798088053424128]

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

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