A331704 - cp's OEIS frontend

A331704 Number of nonnegative integer matrices with n distinct columns and any number of distinct nonzero rows with column sums 2 and columns in decreasing lexicographic order.

n	a(n)
0	1
1	1
2	6
3	46
4	544
5	7983
6	144970
7	3097825
8	76494540
9	2139610590
10	66898897827
11	2311748912745
12	87494097274959
13	3599356204576335
14	159917091369687135
15	7631292367127171222
16	389282192196378927707
17	21138914821756778420757
18	1217459545430430305769230

[1, 1, 6, 46, 544, 7983, 144970, 3097825, 76494540, 2139610590, 66898897827, 2311748912745, 87494097274959, 3599356204576335, 159917091369687135, 7631292367127171222, 389282192196378927707, 21138914821756778420757, 1217459545430430305769230]

cp's OEIS Frontend

A331704 Number of nonnegative integer matrices with n distinct columns and any number of distinct nonzero rows with column sums 2 and columns in decreasing lexicographic order.

Table of values

List of values