A128831 - cp's OEIS frontend

A128831 Number of n-tuples where each entry is chosen from the subsets of {1,2,3} such that the intersection of all n entries is empty.

n	a(n)
1	1
2	27
3	343
4	3375
5	29791
6	250047
7	2048383
8	16581375
9	133432831
10	1070599167
11	8577357823
12	68669157375
13	549554511871
14	4397241253887
15	35181150961663
16	281462092005375
17	2251748274470911
18	18014192351838207
19	144114363443707903

[1, 27, 343, 3375, 29791, 250047, 2048383, 16581375, 133432831, 1070599167, 8577357823, 68669157375, 549554511871, 4397241253887, 35181150961663, 281462092005375, 2251748274470911, 18014192351838207, 144114363443707903]

cp's OEIS Frontend

A128831 Number of n-tuples where each entry is chosen from the subsets of {1,2,3} such that the intersection of all n entries is empty.

Table of values

List of values