A133224 - cp's OEIS frontend

A133224 Let P(A) be the power set of an n-element set A and let B be the Cartesian product of P(A) with itself. Remove (y,x) from B when (x,y) is in B and x <> y and let R35 denote the reduced set B. Then a(n) = the sum of the sizes of the union of x and y for every (x,y) in R35.

n	a(n)
0	0
1	2
2	14
3	78
4	400
5	1960
6	9312
7	43232
8	197120
9	885888
10	3934720
11	17307136
12	75509760
13	327182336
14	1409343488
15	6039920640
16	25770065920
17	109522223104
18	463857647616
19	1958507577344
20	8246342451200

[0, 2, 14, 78, 400, 1960, 9312, 43232, 197120, 885888, 3934720, 17307136, 75509760, 327182336, 1409343488, 6039920640, 25770065920, 109522223104, 463857647616, 1958507577344, 8246342451200]

cp's OEIS Frontend

A133224 Let P(A) be the power set of an n-element set A and let B be the Cartesian product of P(A) with itself. Remove (y,x) from B when (x,y) is in B and x <> y and let R35 denote the reduced set B. Then a(n) = the sum of the sizes of the union of x and y for every (x,y) in R35.

Table of values

List of values