A327494 - cp's OEIS frontend

A327494 a(n) = numerator(r(n)) where r(n) = Sum_{j=0..n} j!/(2^j*floor(j/2)!)^2.

n	a(n)
0	1
1	5
2	11
3	47
4	191
5	779
6	1563
7	6287
8	50331
9	201639
10	403341
11	1614057
12	6456459
13	25828839
14	51658107
15	206638863
16	3306228243
17	13225022367
18	26450056889
19	105800458501
20	423201880193
21	1692808490741
22	3385617069661
23	13542470306761
24	108339763130127
25	433359069421483

[1, 5, 11, 47, 191, 779, 1563, 6287, 50331, 201639, 403341, 1614057, 6456459, 25828839, 51658107, 206638863, 3306228243, 13225022367, 26450056889, 105800458501, 423201880193, 1692808490741, 3385617069661, 13542470306761, 108339763130127, 433359069421483]

cp's OEIS Frontend

A327494 a(n) = numerator(r(n)) where r(n) = Sum_{j=0..n} j!/(2^j*floor(j/2)!)^2.

Table of values

List of values