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.

A170740 Expansion of g.f.: (1+x)/(1-20*x).

Table of values

n a(n)
0 1
1 21
2 420
3 8400
4 168000
5 3360000
6 67200000
7 1344000000
8 26880000000
9 537600000000
10 10752000000000
11 215040000000000
12 4300800000000000
13 86016000000000000
14 1720320000000000000
15 34406400000000000000
16 688128000000000000000
17 13762560000000000000000
18 275251200000000000000000

List of values

[1, 21, 420, 8400, 168000, 3360000, 67200000, 1344000000, 26880000000, 537600000000, 10752000000000, 215040000000000, 4300800000000000, 86016000000000000, 1720320000000000000, 34406400000000000000, 688128000000000000000, 13762560000000000000000, 275251200000000000000000]

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

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