A349270 - cp's OEIS frontend

A349270 a(n) = Sum_{k=0..n} (n - k)! * k! / floor(k / 2)!^2, row sums of A349269.

n	a(n)
0	1
1	2
2	5
3	16
4	46
5	204
6	986
7	6400
8	48094
9	420140
10	4112822
11	44575584
12	528787260
13	6811260792
14	94637153172
15	1410542965248
16	22446384533142
17	379801729831500
18	6808478318116238
19	128895044005636960
20	2569653423591937156
21	53808349548318974312
22	1180737041228428129580

[1, 2, 5, 16, 46, 204, 986, 6400, 48094, 420140, 4112822, 44575584, 528787260, 6811260792, 94637153172, 1410542965248, 22446384533142, 379801729831500, 6808478318116238, 128895044005636960, 2569653423591937156, 53808349548318974312, 1180737041228428129580]

cp's OEIS Frontend

A349270 a(n) = Sum_{k=0..n} (n - k)! * k! / floor(k / 2)!^2, row sums of A349269.

Table of values

List of values