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.

A120733 Number of matrices with nonnegative integer entries and without zero rows or columns such that sum of all entries is equal to n.

Table of values

n a(n)
0 1
1 1
2 5
3 33
4 281
5 2961
6 37277
7 546193
8 9132865
9 171634161
10 3581539973
11 82171451025
12 2055919433081
13 55710251353953
14 1625385528173693
15 50800411296363617
16 1693351638586070209
17 59966271207156833313
18 2248276994650395873861
19 88969158875611127548481

List of values

[1, 1, 5, 33, 281, 2961, 37277, 546193, 9132865, 171634161, 3581539973, 82171451025, 2055919433081, 55710251353953, 1625385528173693, 50800411296363617, 1693351638586070209, 59966271207156833313, 2248276994650395873861, 88969158875611127548481]

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

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