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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.

A212856 Number of 3 X n arrays with rows being permutations of 0..n-1 and no column j greater than column j-1 in all rows.

Table of values

n a(n)
0 1
1 1
2 7
3 163
4 8983
5 966751
6 179781181
7 53090086057
8 23402291822743
9 14687940716402023
10 12645496977257273257
11 14490686095184389113277
12 21557960797148733086439949
13 40776761007750226749220637461
14 96332276574683758035941025907591

List of values

[1, 1, 7, 163, 8983, 966751, 179781181, 53090086057, 23402291822743, 14687940716402023, 12645496977257273257, 14490686095184389113277, 21557960797148733086439949, 40776761007750226749220637461, 96332276574683758035941025907591]

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

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