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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.

A370620 Coefficient of x^n in the expansion of 1 / (1-x-x^2)^(3*n).

Table of values

n a(n)
0 1
1 3
2 27
3 255
4 2535
5 25908
6 269667
7 2843214
8 30264975
9 324543495
10 3500669172
11 37940361660
12 412830243735
13 4507040972190
14 49345845670470
15 541602648192480
16 5957253066586815
17 65650003858745514
18 724693081872783375
19 8011727857439155500
20 88692087094226151300

List of values

[1, 3, 27, 255, 2535, 25908, 269667, 2843214, 30264975, 324543495, 3500669172, 37940361660, 412830243735, 4507040972190, 49345845670470, 541602648192480, 5957253066586815, 65650003858745514, 724693081872783375, 8011727857439155500, 88692087094226151300]

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

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