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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.

A301307 G.f.: Sum_{n>=0} (1 + (1+x)^n)^n / 3^(n+1).

Table of values

n a(n)
0 1
1 5
2 98
3 3239
4 150176
5 8958473
6 653364947
7 56325265925
8 5603297711741
9 631787569243643
10 79620187792726844
11 11090608163844996365
12 1692024644610151317068
13 280593919265423518611017
14 50255068227934275890880470
15 9667645123441963396364779439
16 1988058929295585346059732920903
17 435204469378969786061222253686549
18 101044871217450582545711556498557285

List of values

[1, 5, 98, 3239, 150176, 8958473, 653364947, 56325265925, 5603297711741, 631787569243643, 79620187792726844, 11090608163844996365, 1692024644610151317068, 280593919265423518611017, 50255068227934275890880470, 9667645123441963396364779439, 1988058929295585346059732920903, 435204469378969786061222253686549, 101044871217450582545711556498557285]

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

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