A011920 - cp's OEIS frontend

A011920 a(n) = b(n)*(b(n)+1) = b(n) + ... + c(n), where b(n) = A011916(n), c(n) = A011918(n).

n	a(n)
1	12
2	1980
3	378840
4	73419192
5	14241916260
6	2762844014580
7	535977297450672
8	103976830083273840
9	20170969020163148220
10	3913064012542622257452
11	759114247456742016195720
12	147264250942490855924510760

[12, 1980, 378840, 73419192, 14241916260, 2762844014580, 535977297450672, 103976830083273840, 20170969020163148220, 3913064012542622257452, 759114247456742016195720, 147264250942490855924510760]

cp's OEIS Frontend

A011920 a(n) = b(n)*(b(n)+1) = b(n) + ... + c(n), where b(n) = A011916(n), c(n) = A011918(n).

Table of values

List of values