A101476 - cp's OEIS frontend

A101476 Sum[k=0..n, Sum[i>=0, C(2n,n-i(k+2))-C(2n,n+i(k+2)+k+1) ]].

n	a(n)
0	1
1	3
2	14
3	64
4	287
5	1265
6	5500
7	23660
8	100931
9	427669
10	1802170
11	7559473
12	31586889
13	131548937
14	546297862
15	2263042926
16	9354234285
17	38590884287
18	158932839678
19	653540335951
20	2683657672278
21	11006131763414
22	45086288225520

[1, 3, 14, 64, 287, 1265, 5500, 23660, 100931, 427669, 1802170, 7559473, 31586889, 131548937, 546297862, 2263042926, 9354234285, 38590884287, 158932839678, 653540335951, 2683657672278, 11006131763414, 45086288225520]

cp's OEIS Frontend

A101476 Sum[k=0..n, Sum[i>=0, C(2n,n-i(k+2))-C(2n,n+i(k+2)+k+1) ]].

Table of values

List of values