A196442 - cp's OEIS frontend

A196442 a(1) = a(2) = 1; for n >= 2, a(n) is the product of number k <= n such that GCQ_A(n, k) >= 2 (see definition in comments).

n	a(n)
1	1
2	1
3	3
4	4
5	60
6	30
7	2520
8	6720
9	45360
10	604800
11	19958400
12	3991680
13	3113510400
14	14529715200
15	163459296000
16	3487131648000
17	177843714048000
18	266765571072000
19	60822550204416000
20	67580611338240000
21	6386367771463680000
22	187333454629601280000
23	12926008369442488320000
24	5170403347776995328000
25	7755605021665492992000000
26	67215243521100939264000000

[1, 1, 3, 4, 60, 30, 2520, 6720, 45360, 604800, 19958400, 3991680, 3113510400, 14529715200, 163459296000, 3487131648000, 177843714048000, 266765571072000, 60822550204416000, 67580611338240000, 6386367771463680000, 187333454629601280000, 12926008369442488320000, 5170403347776995328000, 7755605021665492992000000, 67215243521100939264000000]

cp's OEIS Frontend

A196442 a(1) = a(2) = 1; for n >= 2, a(n) is the product of number k <= n such that GCQ_A(n, k) >= 2 (see definition in comments).

Table of values

List of values