A216857 - cp's OEIS frontend

A216857 Number of connected functions from {1,2,...,n} into a subset of {1,2,...,n} that have a fixed point summed over all subsets.

n	a(n)
0	0
1	1
2	4
3	24
4	224
5	2880
6	47232
7	942592
8	22171648
9	600698880
10	18422374400
11	630897721344
12	23864653578240
13	988197253808128
14	44460603225407488
15	2159714024218951680
16	112652924603290615808
17	6280048587936003784704
18	372616014329572403183616
19	23445082059018189741752320
20	1559275240299007139066675200

[0, 1, 4, 24, 224, 2880, 47232, 942592, 22171648, 600698880, 18422374400, 630897721344, 23864653578240, 988197253808128, 44460603225407488, 2159714024218951680, 112652924603290615808, 6280048587936003784704, 372616014329572403183616, 23445082059018189741752320, 1559275240299007139066675200]

cp's OEIS Frontend

A216857 Number of connected functions from {1,2,...,n} into a subset of {1,2,...,n} that have a fixed point summed over all subsets.

Table of values

List of values