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.

A331647 Number of nonnegative integer matrices with 3 columns and any number of distinct nonzero rows with column sums n.

Table of values

n a(n)
0 1
1 13
2 313
3 11655
4 439779
5 14699033
6 453027131
7 14035890205
8 418049781331
9 11878976385087
10 326859368114097
11 8708114475309677
12 224507928640721933
13 5621130329235752857
14 136998397230581620801
15 3253556714665728184671
16 75415948071516657175683
17 1708706073099458659898237

List of values

[1, 13, 313, 11655, 439779, 14699033, 453027131, 14035890205, 418049781331, 11878976385087, 326859368114097, 8708114475309677, 224507928640721933, 5621130329235752857, 136998397230581620801, 3253556714665728184671, 75415948071516657175683, 1708706073099458659898237]

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

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