A215990 - cp's OEIS frontend

A215990 Numerator of sum( k!/2^k, k=1..n ).

n	a(n)
0	0
1	1
2	1
3	7
4	13
5	7
6	73
7	461
8	1721
9	7391
10	35741
11	95833
12	140902
13	7208291
14	6221977
15	738064507
16	5846167507
17	49265043007
18	440034922507
19	4152348777757
20	41275487330257
21	431068442131507
22	4718790944945257
23	27013799863651691
24	322866652557800441
25	502628413904332477

[0, 1, 1, 7, 13, 7, 73, 461, 1721, 7391, 35741, 95833, 140902, 7208291, 6221977, 738064507, 5846167507, 49265043007, 440034922507, 4152348777757, 41275487330257, 431068442131507, 4718790944945257, 27013799863651691, 322866652557800441, 502628413904332477]

cp's OEIS Frontend

A215990 Numerator of sum( k!/2^k, k=1..n ).

Table of values

List of values