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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.

A006149 Number of 3-tuples (p_1, p_2, p_3) of Dyck paths of semilength n, such that each p_i is never below p_{i-1}.

Table of values

n a(n)
0 1
1 1
2 4
3 30
4 330
5 4719
6 81796
7 1643356
8 37119160
9 922268360
10 24801924512
11 713055329720
12 21706243125300
13 694280570551875
14 23188541161342500
15 804601696647424500
16 28880966163870711000
17 1068595748063216307000
18 40631980618055892780000
19 1583603339463794983230000

List of values

[1, 1, 4, 30, 330, 4719, 81796, 1643356, 37119160, 922268360, 24801924512, 713055329720, 21706243125300, 694280570551875, 23188541161342500, 804601696647424500, 28880966163870711000, 1068595748063216307000, 40631980618055892780000, 1583603339463794983230000]

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

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