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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.

A187018 Coefficient of x^n in (1 + x + n*x^2)^n.

Table of values

n a(n)
0 1
1 1
2 5
3 19
4 145
5 851
6 7741
7 58605
8 600769
9 5420035
10 61026901
11 628076153
12 7648488145
13 87388647373
14 1138801242125
15 14182492489651
16 196218339243777
17 2628971539313875
18 38377805385510181
19 547815690902283225
20 8395817775835635601
21 126725586542235932329

List of values

[1, 1, 5, 19, 145, 851, 7741, 58605, 600769, 5420035, 61026901, 628076153, 7648488145, 87388647373, 1138801242125, 14182492489651, 196218339243777, 2628971539313875, 38377805385510181, 547815690902283225, 8395817775835635601, 126725586542235932329]

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

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