A190908 - cp's OEIS frontend

A190908 a(n) = Sum{0<=k<=n} binomial(n+k, n-k) * k! / (floor(k/2)! * floor((k+2)/2)!).

n	a(n)
0	1
1	2
2	5
3	15
4	49
5	163
6	549
7	1875
8	6477
9	22571
10	79213
11	279631
12	991985
13	3533707
14	12632909
15	45301795
16	162890781
17	587091795
18	2120442517
19	7672891151
20	27811187377
21	100956896179
22	366983328885
23	1335662387699

[1, 2, 5, 15, 49, 163, 549, 1875, 6477, 22571, 79213, 279631, 991985, 3533707, 12632909, 45301795, 162890781, 587091795, 2120442517, 7672891151, 27811187377, 100956896179, 366983328885, 1335662387699]

cp's OEIS Frontend

A190908 a(n) = Sum{0<=k<=n} binomial(n+k, n-k) * k! / (floor(k/2)! * floor((k+2)/2)!).

Table of values

List of values