A303566 - cp's OEIS frontend

A303566 a(n) = [x^n] (Sum_{k=0..n} (k+1)!x^k)/(Sum_{k=0..n} (k+1)!(-x)^k).

n	a(n)
0	1
1	4
2	8
3	40
4	128
5	1168
6	4448
7	66400
8	268544
9	6124480
10	25118336
11	827294848
12	3386501120
13	153439657216
14	624706655744
15	37378784384512
16	151446759993344
17	11573673369828352
18	46729404312578048
19	4439994292732364800
20	17884613664930529280
21	2067374053521268559872

[1, 4, 8, 40, 128, 1168, 4448, 66400, 268544, 6124480, 25118336, 827294848, 3386501120, 153439657216, 624706655744, 37378784384512, 151446759993344, 11573673369828352, 46729404312578048, 4439994292732364800, 17884613664930529280, 2067374053521268559872]

cp's OEIS Frontend

A303566 a(n) = [x^n] (Sum_{k=0..n} (k+1)!x^k)/(Sum_{k=0..n} (k+1)!(-x)^k).

Table of values

List of values

cp's OEIS Frontend

A303566 a(n) = [x^n] (Sum_{k=0..n} (k+1)!*x^k)/(Sum_{k=0..n} (k+1)!*(-x)^k).

Table of values

List of values

A303566 a(n) = [x^n] (Sum_{k=0..n} (k+1)!x^k)/(Sum_{k=0..n} (k+1)!(-x)^k).