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.

A151644 Number of permutations of 4 indistinguishable copies of 1..n with exactly 6 adjacent element pairs in decreasing order.

Table of values

n a(n)
1 0
2 0
3 1828
4 21571984
5 29066972368
6 16938467955200
7 6501926870387116
8 1978065945844840160
9 524378714083391626872
10 127734445724723139679472
11 29503552588857666326833140
12 6587452899587031432766113392
13 1439127765510353092008927027552
14 310010313330353917185364216860320

List of values

[0, 0, 1828, 21571984, 29066972368, 16938467955200, 6501926870387116, 1978065945844840160, 524378714083391626872, 127734445724723139679472, 29503552588857666326833140, 6587452899587031432766113392, 1439127765510353092008927027552, 310010313330353917185364216860320]

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

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