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.

A264077 Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive step pattern up, down, up, down.

Table of values

n a(n)
7 272
8 4352
9 42880
10 530432
11 7662336
12 101713920
13 1402932224
14 21604831232
15 343423787008
16 5608501018624
17 97560785780736
18 1783363198386176
19 33762252617416704
20 668148809474244608
21 13830009274919288832
22 297227159309157138432
23 6632506903059366936576

List of values

[272, 4352, 42880, 530432, 7662336, 101713920, 1402932224, 21604831232, 343423787008, 5608501018624, 97560785780736, 1783363198386176, 33762252617416704, 668148809474244608, 13830009274919288832, 297227159309157138432, 6632506903059366936576]

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

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