cp's OEIS Frontend

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.

A152509 1/30 of the number of permutations of 5 indistinguishable copies of 1..n with exactly 2 local maxima.

Table of values

n a(n)
1 0
2 2
3 139
4 8036
5 452068
6 25331360
7 1418668912
8 79446252224
9 4448995583296
10 249143789616128
11 13952052465406720
12 781314939695363072
13 43753636633642845184
14 2450203651553656365056
15 137211404487455350386688
16 7683838651300399095726080
17 430294964472840921667551232

List of values

[0, 2, 139, 8036, 452068, 25331360, 1418668912, 79446252224, 4448995583296, 249143789616128, 13952052465406720, 781314939695363072, 43753636633642845184, 2450203651553656365056, 137211404487455350386688, 7683838651300399095726080, 430294964472840921667551232]

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

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