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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.

A321603 G.f. A(x) satisfies: 1 = Sum_{n>=0} ((1+x)^(3*n) - A(x))^n.

Table of values

n a(n)
0 1
1 3
2 12
3 235
4 7872
5 351924
6 19340668
7 1250971416
8 92720438955
9 7733929764167
10 716488771114410
11 72981787493017014
12 8107675760704948748
13 975749719762368998037
14 126491959992115408069503
15 17576241581408197850363955
16 2606439876885873198662077692
17 410925212330248782377865281826
18 68641203626673300062880912740755
19 12110976733338358608040713750036252

List of values

[1, 3, 12, 235, 7872, 351924, 19340668, 1250971416, 92720438955, 7733929764167, 716488771114410, 72981787493017014, 8107675760704948748, 975749719762368998037, 126491959992115408069503, 17576241581408197850363955, 2606439876885873198662077692, 410925212330248782377865281826, 68641203626673300062880912740755, 12110976733338358608040713750036252]

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

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