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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.

A354298 a(n) is the numerator of Sum_{k=1..n} (-1)^(k+1) / (2*k-1)!!.

Table of values

n a(n)
1 1
2 2
3 11
4 76
5 137
6 7534
7 97943
8 1469144
9 24975449
10 94906706
11 9965204131
12 229199695012
13 5729992375301
14 9100576125478
15 897316805972131
16 563093542209232
17 4589775462547450033
18 5539384178936577626
19 5943759223998947792699
20 46361321947191792783052
21 9504070999174317520525661

List of values

[1, 2, 11, 76, 137, 7534, 97943, 1469144, 24975449, 94906706, 9965204131, 229199695012, 5729992375301, 9100576125478, 897316805972131, 563093542209232, 4589775462547450033, 5539384178936577626, 5943759223998947792699, 46361321947191792783052, 9504070999174317520525661]

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

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