A359067 - cp's OEIS frontend

A359067 a(2n) = Sum_{k=0..n-1} binomial(2n,k) binomial(2n-1-k, n-1-k). a(2n+1) = (Sum_{k=0..n} binomial(2n+1,k) binomial(2n-k, n-k)) - binomial(2*n-1, n).

n	a(n)
1	0
2	1
3	4
4	7
5	28
6	49
7	199
8	351
9	1436
10	2561
11	10499
12	18943
13	77617
14	141569
15	579149
16	1066495
17	4354780
18	8085505
19	32954635
20	61616127
21	250713893
22	471556097
23	1915928117
24	3621830655
25	14696701553
26	27902803969
27	113099318869
28	215530668031
29	872780984131
30	1668644405249
31	6751457741849

[0, 1, 4, 7, 28, 49, 199, 351, 1436, 2561, 10499, 18943, 77617, 141569, 579149, 1066495, 4354780, 8085505, 32954635, 61616127, 250713893, 471556097, 1915928117, 3621830655, 14696701553, 27902803969, 113099318869, 215530668031, 872780984131, 1668644405249, 6751457741849]

cp's OEIS Frontend

A359067 a(2n) = Sum_{k=0..n-1} binomial(2n,k) binomial(2n-1-k, n-1-k). a(2n+1) = (Sum_{k=0..n} binomial(2n+1,k) binomial(2n-k, n-k)) - binomial(2*n-1, n).

Table of values

List of values

cp's OEIS Frontend

A359067 a(2*n) = Sum_{k=0..n-1} binomial(2*n,k) binomial(2*n-1-k, n-1-k). a(2*n+1) = (Sum_{k=0..n} binomial(2*n+1,k) binomial(2*n-k, n-k)) - binomial(2*n-1, n).

Table of values

List of values

A359067 a(2n) = Sum_{k=0..n-1} binomial(2n,k) binomial(2n-1-k, n-1-k). a(2n+1) = (Sum_{k=0..n} binomial(2n+1,k) binomial(2n-k, n-k)) - binomial(2*n-1, n).