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.

A321588 Number of connected nonnegative integer matrices with sum of entries equal to n, no zero rows or columns, and distinct rows and columns.

Table of values

n a(n)
0 1
1 1
2 1
3 9
4 29
5 181
6 1285
7 10635
8 102355
9 1118021
10 13637175
11 184238115
12 2727293893
13 43920009785
14 764389610843
15 14297306352937
16 286014489487815
17 6093615729757841
18 137750602009548533
19 3293082026520294529
20 83006675263513350581
21 2200216851785981586729
22 61180266502369886181253

List of values

[1, 1, 1, 9, 29, 181, 1285, 10635, 102355, 1118021, 13637175, 184238115, 2727293893, 43920009785, 764389610843, 14297306352937, 286014489487815, 6093615729757841, 137750602009548533, 3293082026520294529, 83006675263513350581, 2200216851785981586729, 61180266502369886181253]

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

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