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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.

A370285 Coefficient of x^n in the expansion of ( (1+x)^2 + x^3 )^n.

Table of values

n a(n)
0 1
1 2
2 6
3 23
4 94
5 392
6 1659
7 7107
8 30734
9 133880
10 586576
11 2582142
12 11411371
13 50597900
14 224986467
15 1002867878
16 4479814606
17 20049099908
18 89878609344
19 403521966942
20 1814102538624
21 8165526187128
22 36794746597494
23 165968135843522
24 749314496125451
25 3385881647958442

List of values

[1, 2, 6, 23, 94, 392, 1659, 7107, 30734, 133880, 586576, 2582142, 11411371, 50597900, 224986467, 1002867878, 4479814606, 20049099908, 89878609344, 403521966942, 1814102538624, 8165526187128, 36794746597494, 165968135843522, 749314496125451, 3385881647958442]

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

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