A131288 - cp's OEIS frontend

A131288 a(n) = number of ways to choose a collection C of subsets of U = [1,2,...,n] such that Union_{S in C} = U, Intersection_{S in C} = empty set.

n	a(n)
0	2
1	1
2	7
3	193
4	63775
5	4294321153
6	18446744022173838463
7	340282366920938463205120190760593525761
8	115792089237316195423570985008687907847825466794905548626109625623336235655679

[2, 1, 7, 193, 63775, 4294321153, 18446744022173838463, 340282366920938463205120190760593525761, 115792089237316195423570985008687907847825466794905548626109625623336235655679]

cp's OEIS Frontend

A131288 a(n) = number of ways to choose a collection C of subsets of U = [1,2,...,n] such that Union_{S in C} = U, Intersection_{S in C} = empty set.

Table of values

List of values