cp's OEIS Frontend

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.

A370184 Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x+x^3) )^n.

Table of values

n a(n)
0 1
1 3
2 15
3 87
4 539
5 3458
6 22659
7 150594
8 1011131
9 6841779
10 46577430
11 318654900
12 2188931699
13 15087882943
14 104301302218
15 722840860787
16 5020500381131
17 34937184351049
18 243539967641271
19 1700255814753027
20 11886457488148674
21 83200718154710607
22 583026777685802256

List of values

[1, 3, 15, 87, 539, 3458, 22659, 150594, 1011131, 6841779, 46577430, 318654900, 2188931699, 15087882943, 104301302218, 722840860787, 5020500381131, 34937184351049, 243539967641271, 1700255814753027, 11886457488148674, 83200718154710607, 583026777685802256]

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

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