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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.

A292221 Expansion of the exponential generating function (1/2)*(1 + 4*x)*(1 - (1 + 4*x)^(-3/2))/x.

Table of values

n a(n)
0 3
1 -3
2 20
3 -210
4 3024
5 -55440
6 1235520
7 -32432400
8 980179200
9 -33522128640
10 1279935820800
11 -53970627110400
12 2490952020480000
13 -124903451312640000
14 6761440164390912000
15 -393008709555221760000
16 24412776311194951680000
17 -1613955767240110694400000
18 113146793787569865523200000
19 -8384177419658927035269120000

List of values

[3, -3, 20, -210, 3024, -55440, 1235520, -32432400, 980179200, -33522128640, 1279935820800, -53970627110400, 2490952020480000, -124903451312640000, 6761440164390912000, -393008709555221760000, 24412776311194951680000, -1613955767240110694400000, 113146793787569865523200000, -8384177419658927035269120000]

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

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