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.

A370185 Coefficient of x^n in the expansion of (1+x+x^3)^(2*n).

Table of values

n a(n)
0 1
1 2
2 6
3 26
4 126
5 612
6 2970
7 14534
8 71838
9 357884
10 1793296
11 9026976
12 45612450
13 231224060
14 1175422590
15 5989693176
16 30586693182
17 156483812892
18 801908994852
19 4115509738188
20 21149522157816
21 108817959549416
22 560500440662872
23 2889915938877078
24 14913928051929426

List of values

[1, 2, 6, 26, 126, 612, 2970, 14534, 71838, 357884, 1793296, 9026976, 45612450, 231224060, 1175422590, 5989693176, 30586693182, 156483812892, 801908994852, 4115509738188, 21149522157816, 108817959549416, 560500440662872, 2889915938877078, 14913928051929426]

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

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