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A256571
as a simple table
n
a(n)
1
1
2
6
3
21
4
56
5
131
6
281
7
556
8
1046
9
1896
10
3346
11
5796
12
9916
13
16806
14
28316
15
47506
16
79476
17
132706
[1,6,21,56,131,281,556,1046,1896,3346,5796,9916, 16806,28316,47506,79476,132706]