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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.

A277303 G.f. satisfies: A(x - 4*A(x)^2) = x + A(x)^2.

Table of values

n a(n)
1 1
2 5
3 90
4 2425
5 80630
6 3065810
7 128271540
8 5774538945
9 275743894750
10 13832116773110
11 723891526915820
12 39323723086794730
13 2208811824884144540
14 127904686371063157700
15 7617441454740093233000
16 465691699545009287055825
17 29179499379365501297165550
18 1871486497257264286902367950
19 122731222232573572625823907900
20 8222122259910817121846641763950
21 562251437460415648354364719018900

List of values

[1, 5, 90, 2425, 80630, 3065810, 128271540, 5774538945, 275743894750, 13832116773110, 723891526915820, 39323723086794730, 2208811824884144540, 127904686371063157700, 7617441454740093233000, 465691699545009287055825, 29179499379365501297165550, 1871486497257264286902367950, 122731222232573572625823907900, 8222122259910817121846641763950, 562251437460415648354364719018900]

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

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