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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.

A290046 a(n) = |Sum_{k=0..n} (-1)^k*(3k)!!|.

Table of values

n a(n)
0 1
1 2
2 46
3 899
4 45181
5 1981844
6 183812716
7 13565497859
8 1948425055741
9 11509621621134
10 42638364069002866
11 6290021506693847759
12 1672053831207666984241
13 318158932941670103831384
14 106827312624343125411048616
15 25266964023001914822246560759

List of values

[1, 2, 46, 899, 45181, 1981844, 183812716, 13565497859, 1948425055741, 11509621621134, 42638364069002866, 6290021506693847759, 1672053831207666984241, 318158932941670103831384, 106827312624343125411048616, 25266964023001914822246560759]

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

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