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.

A370215 Coefficient of x^n in the expansion of ( (1+x)^2 / (1-x^3)^2 )^n.

Table of values

n a(n)
0 1
1 2
2 6
3 26
4 134
5 702
6 3642
7 18916
8 99078
9 523448
10 2783406
11 14870418
12 79743002
13 428987236
14 2314194840
15 12514276476
16 67815709958
17 368183248722
18 2002240199040
19 10904629019548
20 59468066955534
21 324698112501166
22 1774806572174862
23 9710825272099992
24 53181284133726618

List of values

[1, 2, 6, 26, 134, 702, 3642, 18916, 99078, 523448, 2783406, 14870418, 79743002, 428987236, 2314194840, 12514276476, 67815709958, 368183248722, 2002240199040, 10904629019548, 59468066955534, 324698112501166, 1774806572174862, 9710825272099992, 53181284133726618]

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

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