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.

A212857 Number of 4 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 15
3 1135
4 271375
5 158408751
6 191740223841
7 429966316953825
8 1644839120884915215
9 10079117505143103766735
10 94135092186827772028779265
11 1287215725538576868883610346465
12 24929029117106417518788960414909025
13 664978827664071363541997348802227351425

List of values

[1, 1, 15, 1135, 271375, 158408751, 191740223841, 429966316953825, 1644839120884915215, 10079117505143103766735, 94135092186827772028779265, 1287215725538576868883610346465, 24929029117106417518788960414909025, 664978827664071363541997348802227351425]

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

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