A068102 - cp's OEIS frontend

A068102 a(n) = n! * 2^n * Sum_{i=1..n} 1/(i*2^i).

n	a(n)
1	1
2	5
3	32
4	262
5	2644
6	31848
7	446592
8	7150512
9	128749536
10	2575353600
11	56661408000
12	1359913708800
13	35358235430400
14	990036819072000
15	29701191750451200
16	950439443688806400
17	32314962008209305600
18	1163338987982963097600
19	44206887945726303436800
20	1768275639474152546304000

[1, 5, 32, 262, 2644, 31848, 446592, 7150512, 128749536, 2575353600, 56661408000, 1359913708800, 35358235430400, 990036819072000, 29701191750451200, 950439443688806400, 32314962008209305600, 1163338987982963097600, 44206887945726303436800, 1768275639474152546304000]

cp's OEIS Frontend

A068102 a(n) = n! * 2^n * Sum_{i=1..n} 1/(i*2^i).

Table of values

List of values