A337152 - cp's OEIS frontend

A337152 a(n) = 2^n * (n!)^2 * Sum_{k=0..n} 1 / ((-2)^k * (k!)^2).

n	a(n)
0	1
1	1
2	9
3	161
4	5153
5	257649
6	18550729
7	1817971441
8	232700344449
9	37697455800737
10	7539491160147401
11	1824556860755671041
12	525472375897633259809
13	177609663053400041815441
14	69622987916932816391652873
15	31330344562619767376243792849
16	16041136416061320896636821938689

[1, 1, 9, 161, 5153, 257649, 18550729, 1817971441, 232700344449, 37697455800737, 7539491160147401, 1824556860755671041, 525472375897633259809, 177609663053400041815441, 69622987916932816391652873, 31330344562619767376243792849, 16041136416061320896636821938689]

cp's OEIS Frontend

A337152 a(n) = 2^n * (n!)^2 * Sum_{k=0..n} 1 / ((-2)^k * (k!)^2).

Table of values

List of values