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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.

A053731 a(n) = ceiling(binomial(n,8)/n).

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 1
9 1
10 5
11 15
12 42
13 99
14 215
15 429
16 805
17 1430
18 2431
19 3978
20 6299
21 9690
22 14535
23 21318
24 30645
25 43263
26 60088
27 82225
28 111004
29 148005
30 195098
31 254475
32 328697
33 420732
34 534006
35 672452
36 840565
37 1043460
38 1286934
39 1577532
40 1922618

List of values

[0, 0, 0, 0, 0, 0, 0, 1, 1, 5, 15, 42, 99, 215, 429, 805, 1430, 2431, 3978, 6299, 9690, 14535, 21318, 30645, 43263, 60088, 82225, 111004, 148005, 195098, 254475, 328697, 420732, 534006, 672452, 840565, 1043460, 1286934, 1577532, 1922618]

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

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