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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.

A372417 Coefficient of x^n in the expansion of ( (1-x+x^3)^2 / (1-x)^3 )^n.

Table of values

n a(n)
0 1
1 1
2 3
3 16
4 75
5 336
6 1536
7 7155
8 33627
9 158974
10 755508
11 3606648
12 17281776
13 83068766
14 400368741
15 1934204661
16 9363509531
17 45411373098
18 220593832062
19 1073127878085
20 5227288727580
21 25492636911240
22 124457166046832
23 608207193661734
24 2974913417047440

List of values

[1, 1, 3, 16, 75, 336, 1536, 7155, 33627, 158974, 755508, 3606648, 17281776, 83068766, 400368741, 1934204661, 9363509531, 45411373098, 220593832062, 1073127878085, 5227288727580, 25492636911240, 124457166046832, 608207193661734, 2974913417047440]

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

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