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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.

A378378 a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+3*k-1,3*k).

Table of values

n a(n)
0 1
1 2
2 16
3 170
4 1920
5 22402
6 266800
7 3222634
8 39328768
9 483752258
10 5987236816
11 74474238698
12 930212870784
13 11659157743170
14 146567181170160
15 1847198697449770
16 23332153206562816
17 295286370825453442
18 3743540075432798608
19 47532529217041519658
20 604366048841146280320

List of values

[1, 2, 16, 170, 1920, 22402, 266800, 3222634, 39328768, 483752258, 5987236816, 74474238698, 930212870784, 11659157743170, 146567181170160, 1847198697449770, 23332153206562816, 295286370825453442, 3743540075432798608, 47532529217041519658, 604366048841146280320]

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

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