A331316 - cp's OEIS frontend

A331316 Number of nonnegative integer matrices with n distinct columns and any number of distinct nonzero rows with each column sum being 2 and rows in decreasing lexicographic order.

n	a(n)
0	1
1	1
2	4
3	27
4	266
5	3599
6	62941
7	1372117
8	36248765
9	1135864306
10	41501271477
11	1743624004536
12	83268125043937
13	4476101995389591
14	268589319338401864
15	17860954789864760357
16	1307982591075162739660
17	104895999816356419875935
18	9166919404389461922512723

[1, 1, 4, 27, 266, 3599, 62941, 1372117, 36248765, 1135864306, 41501271477, 1743624004536, 83268125043937, 4476101995389591, 268589319338401864, 17860954789864760357, 1307982591075162739660, 104895999816356419875935, 9166919404389461922512723]

cp's OEIS Frontend

A331316 Number of nonnegative integer matrices with n distinct columns and any number of distinct nonzero rows with each column sum being 2 and rows in decreasing lexicographic order.

Table of values

List of values