A190910 - cp's OEIS frontend

A190910 a(n) = Sum{0<=k<=n} binomial(n+k,n-k) * k! / (floor(k/2)!)^2.

n	a(n)
0	1
1	2
2	6
3	23
4	89
5	338
6	1286
7	4911
8	18769
9	71722
10	273982
11	1046119
12	3991913
13	15222986
14	58013678
15	220939711
16	840883777
17	3198349426
18	12157775958
19	46188298519
20	175376312729
21	665552754018
22	2524513742262
23	9571221986607
24	36271175050321

[1, 2, 6, 23, 89, 338, 1286, 4911, 18769, 71722, 273982, 1046119, 3991913, 15222986, 58013678, 220939711, 840883777, 3198349426, 12157775958, 46188298519, 175376312729, 665552754018, 2524513742262, 9571221986607, 36271175050321]

cp's OEIS Frontend

A190910 a(n) = Sum{0<=k<=n} binomial(n+k,n-k) * k! / (floor(k/2)!)^2.

Table of values

List of values