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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.

A322627 a(n) = [y^(n+1)] (n + y) * Product_{k=1..2*n} (k + y), for n >= 0.

Table of values

n a(n)
0 1
1 4
2 55
3 1260
4 40593
5 1690920
6 86550035
7 5260335080
8 370410456273
9 29664913887180
10 2663386839535695
11 265000164136279572
12 28945346029081686865
13 3443628513369917505360
14 443271719760096505911675
15 61385459345641259759898000
16 9100387546322497725789848865
17 1438068852777042379374392377620
18 241308826278118770656171323634855
19 42852242077203438281471161279058300

List of values

[1, 4, 55, 1260, 40593, 1690920, 86550035, 5260335080, 370410456273, 29664913887180, 2663386839535695, 265000164136279572, 28945346029081686865, 3443628513369917505360, 443271719760096505911675, 61385459345641259759898000, 9100387546322497725789848865, 1438068852777042379374392377620, 241308826278118770656171323634855, 42852242077203438281471161279058300]

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

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