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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.

A303291 G.f. A(x) satisfies: 3 = Sum_{n>=0} (2/3)^n * (1 + x)^(n^2) / A(x)^n.

Table of values

n a(n)
0 1
1 5
2 70
3 3170
4 252160
5 27705800
6 3806286820
7 621124623740
8 116766042046000
9 24783363325335440
10 5854493683431121840
11 1522701357625214096240
12 432347094526718807347480
13 133078785461406479045306360
14 44145742694332046133435657280
15 15702781293109570148744738306240
16 5962874290966165187708554294296880
17 2407878412120285331813837276575565360

List of values

[1, 5, 70, 3170, 252160, 27705800, 3806286820, 621124623740, 116766042046000, 24783363325335440, 5854493683431121840, 1522701357625214096240, 432347094526718807347480, 133078785461406479045306360, 44145742694332046133435657280, 15702781293109570148744738306240, 5962874290966165187708554294296880, 2407878412120285331813837276575565360]

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