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.

A268840 Number of sequences with n copies each of 1,2,3,4 and longest increasing subsequence of length 4.

Table of values

n a(n)
1 1
2 641
3 195709
4 46922017
5 10258694241
6 2176464012941
7 460827731023773
8 98540942707986273
9 21364658238692907265
10 4697818999010952011441
11 1046430770756355786405517
12 235755137688345453796236397
13 53640184515807269993604743389
14 12308974812428409561104536925709

List of values

[1, 641, 195709, 46922017, 10258694241, 2176464012941, 460827731023773, 98540942707986273, 21364658238692907265, 4697818999010952011441, 1046430770756355786405517, 235755137688345453796236397, 53640184515807269993604743389, 12308974812428409561104536925709]

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

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