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.

A331710 Number of nonnegative integer matrices with n columns and any number of distinct nonzero rows with column sums 3 and columns in nonincreasing lexicographic order.

Table of values

n a(n)
0 1
1 3
2 45
3 1987
4 190379
5 30474159
6 7287577611
7 2436916655479
8 1085776582252197
9 621663581843731535
10 444746638465623906738
11 388773810523972862494769
12 407727415097448880517583006
13 505268334502886263575349570013
14 730406898110019766652845079212010

List of values

[1, 3, 45, 1987, 190379, 30474159, 7287577611, 2436916655479, 1085776582252197, 621663581843731535, 444746638465623906738, 388773810523972862494769, 407727415097448880517583006, 505268334502886263575349570013, 730406898110019766652845079212010]

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

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