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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.

A231621 a(n) = A000930(n*(n+1)/2), where A000930 is Narayana's cows sequence.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 28
5 189
6 1873
7 27201
8 578949
9 18059374
10 825604416
11 55315679788
12 5431645680297
13 781666575692345
14 164861247948842305
15 50959194632488457965
16 23085190353310504913320
17 15326793132326730009566200
18 14913379277290330452859885202
19 21267074956884103635776195255433
20 44447403127130268192387935737712641

List of values

[1, 1, 2, 6, 28, 189, 1873, 27201, 578949, 18059374, 825604416, 55315679788, 5431645680297, 781666575692345, 164861247948842305, 50959194632488457965, 23085190353310504913320, 15326793132326730009566200, 14913379277290330452859885202, 21267074956884103635776195255433, 44447403127130268192387935737712641]

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

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