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.

A212850 Number of n X 3 arrays with rows being permutations of 0..2 and no column j greater than column j-1 in all rows.

Table of values

n a(n)
1 1
2 19
3 163
4 1135
5 7291
6 45199
7 275563
8 1666495
9 10038331
10 60348079
11 362442763
12 2175719455
13 13057505371
14 78354598159
15 470156286763
16 2821023814015
17 16926401164411
18 101559181827439
19 609357415487563
20 3656151466494175

List of values

[1, 19, 163, 1135, 7291, 45199, 275563, 1666495, 10038331, 60348079, 362442763, 2175719455, 13057505371, 78354598159, 470156286763, 2821023814015, 16926401164411, 101559181827439, 609357415487563, 3656151466494175]

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

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