A181853 - cp's OEIS frontend

A181853 Triangle read by rows: T(n,k) = Sum_{c in C(n,k)} lcm(c) where C(n,k) is the set of all k-subsets of {1,2,...,n}.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	2
6	1
7	6
8	11
9	6
10	1
11	10
12	31
13	34
14	12
15	1
16	15
17	81
18	189
19	182
20	60
21	1
22	21
23	141
24	393
25	494
26	282
27	60
28	1
29	28
30	288
31	1380
32	3245
33	3740
34	2034
35	420
36	1
37	36
38	456
39	2716
40	8293
41	13268
42	11338
43	4908
44	840
45	1
46	45
47	726
48	5578
49	22207
50	47351
51	57598
52	40602
53	15564
54	2520

[1, 1, 1, 1, 3, 2, 1, 6, 11, 6, 1, 10, 31, 34, 12, 1, 15, 81, 189, 182, 60, 1, 21, 141, 393, 494, 282, 60, 1, 28, 288, 1380, 3245, 3740, 2034, 420, 1, 36, 456, 2716, 8293, 13268, 11338, 4908, 840, 1, 45, 726, 5578, 22207, 47351, 57598, 40602, 15564, 2520]

cp's OEIS Frontend

A181853 Triangle read by rows: T(n,k) = Sum_{c in C(n,k)} lcm(c) where C(n,k) is the set of all k-subsets of {1,2,...,n}.

Table of values

List of values