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.

A081921 Expansion of exp(3x)/sqrt(1-x^2).

Table of values

n a(n)
0 1
1 3
2 10
3 36
4 144
5 648
6 3384
7 20520
8 145728
9 1181952
10 10917504
11 111601152
12 1265777280
13 15544566144
14 208320719616
15 2980582728192
16 46020833427456
17 751100760576000
18 13121167636058112
19 240473024248393728
20 4687531209011183616
21 95293672221284794368

List of values

[1, 3, 10, 36, 144, 648, 3384, 20520, 145728, 1181952, 10917504, 111601152, 1265777280, 15544566144, 208320719616, 2980582728192, 46020833427456, 751100760576000, 13121167636058112, 240473024248393728, 4687531209011183616, 95293672221284794368]

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

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