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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.

A292326 p-INVERT of (1,1,1,0,0,0,0,0,0,0,0,...), where p(S) = (1 - S)^3.

Table of values

n a(n)
0 3
1 9
2 25
3 63
4 153
5 359
6 819
7 1830
8 4018
9 8694
10 18582
11 39298
12 82350
13 171186
14 353338
15 724719
16 1478061
17 2999175
18 6057687
19 12183945
20 24411935
21 48740193
22 96998325
23 192459996
24 380812692
25 751557756
26 1479686972
27 2906717460
28 5698014924
29 11147786740
30 21769549380

List of values

[3, 9, 25, 63, 153, 359, 819, 1830, 4018, 8694, 18582, 39298, 82350, 171186, 353338, 724719, 1478061, 2999175, 6057687, 12183945, 24411935, 48740193, 96998325, 192459996, 380812692, 751557756, 1479686972, 2906717460, 5698014924, 11147786740, 21769549380]