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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.

A377109 a(n) = coefficient of the term that is independent of sqrt(2), sqrt(3), and sqrt(6) in the expansion of (2 + sqrt(2) + sqrt(3))^n.

Table of values

n a(n)
0 1
1 2
2 9
3 38
4 185
5 922
6 4689
7 23998
8 123217
9 633458
10 3258489
11 16765718
12 86273225
13 443967370
14 2284733313
15 11757749038
16 60508271137
17 311391065570
18 1602499602537
19 8246883961094
20 42440638964825
21 218410733951098
22 1123999345270833
23 5784397706237854

List of values

[1, 2, 9, 38, 185, 922, 4689, 23998, 123217, 633458, 3258489, 16765718, 86273225, 443967370, 2284733313, 11757749038, 60508271137, 311391065570, 1602499602537, 8246883961094, 42440638964825, 218410733951098, 1123999345270833, 5784397706237854]

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

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