A094261 - cp's OEIS frontend

A094261 a(n) = n(n-1)(n-3)(n-6)...(n-t), where t is the largest triangular number less than n; number of factors in the product is ceiling((sqrt(1+8*n)-1)/2).

n	a(n)
1	1
2	2
3	6
4	12
5	40
6	90
7	168
8	560
9	1296
10	2520
11	4400
12	14256
13	32760
14	64064
15	113400
16	187200
17	586432
18	1321920
19	2560896
20	4522000
21	7484400
22	11797632
23	35784320
24	78871968
25	150480000
26	263120000
27	433060992
28	681080400
29	1033305728
30	3044304000

[1, 2, 6, 12, 40, 90, 168, 560, 1296, 2520, 4400, 14256, 32760, 64064, 113400, 187200, 586432, 1321920, 2560896, 4522000, 7484400, 11797632, 35784320, 78871968, 150480000, 263120000, 433060992, 681080400, 1033305728, 3044304000]

cp's OEIS Frontend

A094261 a(n) = n(n-1)(n-3)(n-6)...(n-t), where t is the largest triangular number less than n; number of factors in the product is ceiling((sqrt(1+8*n)-1)/2).

Table of values

List of values