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.

A370213 Coefficient of x^n in the expansion of ( (1+x)^2 / (1-x^3) )^n.

Table of values

n a(n)
0 1
1 2
2 6
3 23
4 102
5 477
6 2265
7 10831
8 52134
9 252581
10 1230831
11 6027012
12 29630793
13 146162525
14 723042585
15 3585576123
16 17819138214
17 88723077165
18 442503268107
19 2210287317913
20 11055220684527
21 55362552116104
22 277553123875572
23 1392884816721228
24 6996589905913737

List of values

[1, 2, 6, 23, 102, 477, 2265, 10831, 52134, 252581, 1230831, 6027012, 29630793, 146162525, 723042585, 3585576123, 17819138214, 88723077165, 442503268107, 2210287317913, 11055220684527, 55362552116104, 277553123875572, 1392884816721228, 6996589905913737]

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

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