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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.

A303653 G.f. A(x) satisfies: 1 = Sum_{n>=0} ( 3*(1+x)^n - A(x) )^n / 3^(n+1).

Table of values

n a(n)
0 1
1 15
2 291
3 20868
4 2501535
5 406641390
6 82021892979
7 19576367780568
8 5370958558206975
9 1661471768423203359
10 571522497313691705223
11 216322544080204799422227
12 89344723486622904627485286
13 39989870323587920736747152457
14 19285197574525200774860259575856
15 9970552400727667627167081347333058
16 5502200681071110455003310691040648913

List of values

[1, 15, 291, 20868, 2501535, 406641390, 82021892979, 19576367780568, 5370958558206975, 1661471768423203359, 571522497313691705223, 216322544080204799422227, 89344723486622904627485286, 39989870323587920736747152457, 19285197574525200774860259575856, 9970552400727667627167081347333058, 5502200681071110455003310691040648913]

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

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