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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.

A351118 a(n) is the number of endofunctions on an n-set where there is an element with a preimage of cardinality greater than n/2.

Table of values

n a(n)
1 1
2 2
3 21
4 52
5 905
6 2436
7 58513
8 165096
9 5053329
10 14690260
11 546376721
12 1621207512
13 70973853145
14 213746971816
15 10765350278145
16 32788134075856
17 1867372988701217
18 5737757882873652
19 364586039726904145
20 1128184012390456440
21 79120980149003612841

List of values

[1, 2, 21, 52, 905, 2436, 58513, 165096, 5053329, 14690260, 546376721, 1621207512, 70973853145, 213746971816, 10765350278145, 32788134075856, 1867372988701217, 5737757882873652, 364586039726904145, 1128184012390456440, 79120980149003612841]

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

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