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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.

A239577 Expansion of 1/((x-1)*(3*x-1)*(3*x^2+1)).

Table of values

n a(n)
0 1
1 4
2 10
3 28
4 91
5 280
6 820
7 2440
8 7381
9 22204
10 66430
11 199108
12 597871
13 1794160
14 5380840
15 16140880
16 48427561
17 145287604
18 435848050
19 1307529388
20 3922632451
21 11767941640
22 35303692060
23 105910943320
24 317733228541
25 953200084204
26 2859599056870
27 8578795974868

List of values

[1, 4, 10, 28, 91, 280, 820, 2440, 7381, 22204, 66430, 199108, 597871, 1794160, 5380840, 16140880, 48427561, 145287604, 435848050, 1307529388, 3922632451, 11767941640, 35303692060, 105910943320, 317733228541, 953200084204, 2859599056870, 8578795974868]

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

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