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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.

A273889 a(n) = ((4n-3)!! + (4n-2)!!) / (4n-1).

Table of values

n a(n)
1 1
2 9
3 435
4 52017
5 11592315
6 4152126825
7 2182133628675
8 1581940549814625
9 1512952069890336075
10 1845586177840605209625
11 2796710279417971723681875
12 5153962250373844341910100625
13 11351091844757135191108560046875
14 29444207228221006416048397134215625
15 88848552445321896564985597922269171875

List of values

[1, 9, 435, 52017, 11592315, 4152126825, 2182133628675, 1581940549814625, 1512952069890336075, 1845586177840605209625, 2796710279417971723681875, 5153962250373844341910100625, 11351091844757135191108560046875, 29444207228221006416048397134215625, 88848552445321896564985597922269171875]

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

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