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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.

A307905 Coefficient of x^n in (1 + n*x + x^3)^n.

Table of values

n a(n)
0 1
1 1
2 4
3 30
4 304
5 3875
6 59631
7 1076383
8 22309120
9 522262245
10 13631508400
11 392535959156
12 12362973152751
13 422774554883590
14 15600699362473876
15 617888566413340503
16 26145122799198386944
17 1177107512023013681429
18 56185125998674634494980
19 2834081165961033246374350

List of values

[1, 1, 4, 30, 304, 3875, 59631, 1076383, 22309120, 522262245, 13631508400, 392535959156, 12362973152751, 422774554883590, 15600699362473876, 617888566413340503, 26145122799198386944, 1177107512023013681429, 56185125998674634494980, 2834081165961033246374350]

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

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