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.

A331705 Number of nonnegative integer matrices with n distinct columns and any number of distinct nonzero rows with column sums 3 and columns in decreasing lexicographic order.

Table of values

n a(n)
0 1
1 3
2 42
3 1900
4 184550
5 29724388
6 7137090958
7 2393644524156
8 1068870144819960
9 613045196870306340
10 439190550399403297437
11 384354189217232125992320
12 403475262029493557613389128
13 500401167055816780694578266750
14 723870101627745660876118985228250

List of values

[1, 3, 42, 1900, 184550, 29724388, 7137090958, 2393644524156, 1068870144819960, 613045196870306340, 439190550399403297437, 384354189217232125992320, 403475262029493557613389128, 500401167055816780694578266750, 723870101627745660876118985228250]

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

Content is available under The OEIS End-User License Agreement.