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.

A331344 Number of nonnegative integer matrices with n distinct columns and any number of distinct nonzero rows with each column sum being 3 and rows in decreasing lexicographic order.

Table of values

n a(n)
0 1
1 2
2 15
3 317
4 12586
5 803764
6 75603729
7 9880078404
8 1719511013708
9 385900586669488
10 108870763685147631
11 37821200661333033093
12 15903952714275755480410
13 7978911737260660423782839
14 4717171385049289138016854041
15 3251403192784472823846341645000

List of values

[1, 2, 15, 317, 12586, 803764, 75603729, 9880078404, 1719511013708, 385900586669488, 108870763685147631, 37821200661333033093, 15903952714275755480410, 7978911737260660423782839, 4717171385049289138016854041, 3251403192784472823846341645000]

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

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