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.

A151643 Number of permutations of 4 indistinguishable copies of 1..n with exactly 5 adjacent element pairs in decreasing order.

Table of values

n a(n)
1 0
2 0
3 8464
4 15018688
5 6501577152
6 1585757994496
7 290861341616496
8 45679059507623040
9 6563622028755987104
10 895009629522636673728
11 118277136569294999638992
12 15337783893522951844828992
13 1966328218272794506172178816
14 250347808250994150312231611520

List of values

[0, 0, 8464, 15018688, 6501577152, 1585757994496, 290861341616496, 45679059507623040, 6563622028755987104, 895009629522636673728, 118277136569294999638992, 15337783893522951844828992, 1966328218272794506172178816, 250347808250994150312231611520]

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

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