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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.

A377113 a(n) = coefficient of the term that is independent of sqrt(2), sqrt(3), and sqrt(6) in the expansion of (3 + sqrt(2) + sqrt(3))^n.

Table of values

n a(n)
0 1
1 3
2 14
3 72
4 400
5 2328
6 13904
7 84192
8 513472
9 3143232
10 19278464
11 118359552
12 727045120
13 4467233280
14 27452300288
15 168714381312
16 1036914921472
17 6372994560000
18 39169586880512
19 240744913207296
20 1479676193996800
21 9094462273585152
22 55896907276156928

List of values

[1, 3, 14, 72, 400, 2328, 13904, 84192, 513472, 3143232, 19278464, 118359552, 727045120, 4467233280, 27452300288, 168714381312, 1036914921472, 6372994560000, 39169586880512, 240744913207296, 1479676193996800, 9094462273585152, 55896907276156928]

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

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