A349415 - cp's OEIS frontend

A349415 Number of ways an n-set can be written as the union of 2 sets each with 4 or more elements and whose intersection contains exactly 3 elements.

n	a(n)
5	10
6	60
7	245
8	840
9	2604
10	7560
11	20955
12	56100
13	146146
14	372372
15	931385
16	2293200
17	5569880
18	13368528
19	31751223
20	74709900
21	174324430
22	403700220
23	928512277
24	2122315800
25	4823447300
26	10905187800
27	24536675475
28	54962156340
29	122607890874
30	272461983780
31	603308682865
32	1331439856800

[10, 60, 245, 840, 2604, 7560, 20955, 56100, 146146, 372372, 931385, 2293200, 5569880, 13368528, 31751223, 74709900, 174324430, 403700220, 928512277, 2122315800, 4823447300, 10905187800, 24536675475, 54962156340, 122607890874, 272461983780, 603308682865, 1331439856800]

cp's OEIS Frontend

A349415 Number of ways an n-set can be written as the union of 2 sets each with 4 or more elements and whose intersection contains exactly 3 elements.

Table of values

List of values