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.

A212931 Number of 2Xn 0..n-1 arrays with no column j greater than column j-1 in all rows.

Table of values

n a(n)
1 1
2 15
3 568
4 39695
5 4431876
6 724082352
7 163050236504
8 48442719007503
9 18368207542264060
10 8659014569831436140
11 4968837728849467193040
12 3410836618457710864892912
13 2760233360074280192888992948

List of values

[1, 15, 568, 39695, 4431876, 724082352, 163050236504, 48442719007503, 18368207542264060, 8659014569831436140, 4968837728849467193040, 3410836618457710864892912, 2760233360074280192888992948]

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

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