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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.

A380492 a(n) = n! * Sum_{k=0..n} binomial(2*n-2,k)/(n-k)!.

Table of values

n a(n)
0 1
1 1
2 7
3 73
4 1045
5 19081
6 424051
7 11109337
8 335262313
9 11453449105
10 436944953791
11 18412283563081
12 849345673881277
13 42570185481576793
14 2303643608370636715
15 133859418832759525081
16 8312945340897388101841
17 549460711493172343519777
18 38513032385247860120975863

List of values

[1, 1, 7, 73, 1045, 19081, 424051, 11109337, 335262313, 11453449105, 436944953791, 18412283563081, 849345673881277, 42570185481576793, 2303643608370636715, 133859418832759525081, 8312945340897388101841, 549460711493172343519777, 38513032385247860120975863]

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

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