A216858 - cp's OEIS frontend

A216858 Number of connected functions from {1,2,...,n} into a subset of {1,2,...,n} summed over all subsets.

n	a(n)
0	0
1	1
2	5
3	38
4	422
5	6184
6	112632
7	2453296
8	62202800
9	1799623296
10	58507176320
11	2111633645824
12	83777729991936
13	3624054557443072
14	169759643117603840
15	8560585769442662400
16	462387289560368764928
17	26633435981686107701248
18	1629609677806398679646208
19	105555926477075661655441408
20	7215930505311133152120995840

[0, 1, 5, 38, 422, 6184, 112632, 2453296, 62202800, 1799623296, 58507176320, 2111633645824, 83777729991936, 3624054557443072, 169759643117603840, 8560585769442662400, 462387289560368764928, 26633435981686107701248, 1629609677806398679646208, 105555926477075661655441408, 7215930505311133152120995840]

cp's OEIS Frontend

A216858 Number of connected functions from {1,2,...,n} into a subset of {1,2,...,n} summed over all subsets.

Table of values

List of values