A134019 - cp's OEIS frontend

A134019 Let P(A) be the power set of an n-element set A. Then a(n) = the number of pairs of elements {x,y} of P(A) for which either 0) x and y are intersecting but for which x is not a subset of y and y is not a subset of x, or 1) x = y.

n	a(n)
0	1
1	2
2	4
3	11
4	46
5	227
6	1114
7	5231
8	23566
9	102827
10	438274
11	1836551
12	7601686
13	31183427
14	127084234
15	515429471
16	2083077406
17	8396552027
18	33779262994
19	135696871991
20	544528258726
21	2183337968627
22	8749031918554
23	35043178292111
24	140313885993646
25	561679104393227
26	2247987182714914
27	8995761194057831

[1, 2, 4, 11, 46, 227, 1114, 5231, 23566, 102827, 438274, 1836551, 7601686, 31183427, 127084234, 515429471, 2083077406, 8396552027, 33779262994, 135696871991, 544528258726, 2183337968627, 8749031918554, 35043178292111, 140313885993646, 561679104393227, 2247987182714914, 8995761194057831]

cp's OEIS Frontend

A134019 Let P(A) be the power set of an n-element set A. Then a(n) = the number of pairs of elements {x,y} of P(A) for which either 0) x and y are intersecting but for which x is not a subset of y and y is not a subset of x, or 1) x = y.

Table of values

List of values