A203611 - cp's OEIS frontend

A203611 a(n) = Sum_{k=0..n} binomial(k-1,2k-1-n)binomial(k,2*k-n), with a(0) = 1.

n	a(n)
0	1
1	1
2	1
3	3
4	7
5	16
6	39
7	95
8	233
9	577
10	1436
11	3590
12	9011
13	22691
14	57299
15	145043
16	367931
17	935078
18	2380405
19	6068745
20	15492702
21	39598631
22	101323446
23	259522398
24	665332007
25	1707137941
26	4383662419
27	11264675925
28	28966161253
29	74530441162
30	191879611399
31	494265165151

[1, 1, 1, 3, 7, 16, 39, 95, 233, 577, 1436, 3590, 9011, 22691, 57299, 145043, 367931, 935078, 2380405, 6068745, 15492702, 39598631, 101323446, 259522398, 665332007, 1707137941, 4383662419, 11264675925, 28966161253, 74530441162, 191879611399, 494265165151]

cp's OEIS Frontend

A203611 a(n) = Sum_{k=0..n} binomial(k-1,2k-1-n)binomial(k,2*k-n), with a(0) = 1.

Table of values

List of values

cp's OEIS Frontend

A203611 a(n) = Sum_{k=0..n} binomial(k-1,2*k-1-n)*binomial(k,2*k-n), with a(0) = 1.

Table of values

List of values

A203611 a(n) = Sum_{k=0..n} binomial(k-1,2k-1-n)binomial(k,2*k-n), with a(0) = 1.