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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.

A143404 Expansion of x^k/Product_{t=k..2k} (1-tx) for k=9.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 1
10 135
11 10065
12 547965
13 24336312
14 934863930
15 32189799070
16 1017281878470
17 30001945084683
18 835898091070185
19 22206607023852615
20 566594907018764715
21 13964270139973201114
22 333991935681805199700
23 7781827783346875932300

List of values

[0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 135, 10065, 547965, 24336312, 934863930, 32189799070, 1017281878470, 30001945084683, 835898091070185, 22206607023852615, 566594907018764715, 13964270139973201114, 333991935681805199700, 7781827783346875932300]

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

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