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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.

A187443 A trisection of A001405 (central binomial coefficients): binomial(3n+1,floor((3n+1)/2)), n>=0.

Table of values

n a(n)
0 1
1 6
2 35
3 252
4 1716
5 12870
6 92378
7 705432
8 5200300
9 40116600
10 300540195
11 2333606220
12 17672631900
13 137846528820
14 1052049481860
15 8233430727600
16 63205303218876
17 495918532948104
18 3824345300380220
19 30067266499541040
20 232714176627630544
21 1832624140942590534
22 14226520737620288370
23 112186277816662845432
24 873065282167813104916

List of values

[1, 6, 35, 252, 1716, 12870, 92378, 705432, 5200300, 40116600, 300540195, 2333606220, 17672631900, 137846528820, 1052049481860, 8233430727600, 63205303218876, 495918532948104, 3824345300380220, 30067266499541040, 232714176627630544, 1832624140942590534, 14226520737620288370, 112186277816662845432, 873065282167813104916]

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

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