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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.

A188687 Partial binomial sums of binomial(3n,n)/(2n+1) = A001764(n).

Table of values

n a(n)
0 1
1 2
2 6
3 25
4 126
5 704
6 4183
7 25897
8 165166
9 1077520
10 7156352
11 48222354
12 328859011
13 2265428728
14 15740837575
15 110187356134
16 776336572878
17 5501042194580
18 39177463572112
19 280277949384146
20 2013277273220064
21 14514764553512488
22 104993261648226446

List of values

[1, 2, 6, 25, 126, 704, 4183, 25897, 165166, 1077520, 7156352, 48222354, 328859011, 2265428728, 15740837575, 110187356134, 776336572878, 5501042194580, 39177463572112, 280277949384146, 2013277273220064, 14514764553512488, 104993261648226446]

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

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