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.

A321274 Sum over all permutations of [n] of the minimum of the lengths of longest increasing subsequence and longest decreasing subsequence.

Table of values

n a(n)
1 1
2 2
3 10
4 46
5 274
6 1894
7 14660
8 128648
9 1259740
10 13540882
11 158689006
12 2018664332
13 27699652406
14 407457326286
15 6395402111042
16 106731605965344
17 1887716456363316
18 35269257369001618
19 694027051724655398
20 14346767204627002964
21 310852440258761877068
22 7045172291061429434354

List of values

[1, 2, 10, 46, 274, 1894, 14660, 128648, 1259740, 13540882, 158689006, 2018664332, 27699652406, 407457326286, 6395402111042, 106731605965344, 1887716456363316, 35269257369001618, 694027051724655398, 14346767204627002964, 310852440258761877068, 7045172291061429434354]

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

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