A250604 - OEIS

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A250604 as a simple table

n	a(n)
1	11
2	64
3	297
4	1126
5	3691
6	10928
7	30113
8	78814
9	198651
10	486784
11	1167337
12	2752166
13	6400283
14	14716576
15	33517185
16	75712510
17	169810507
18	378463376
19	838772201
20	1849580902
21	4059957771

[11,64,297,1126,3691,10928,30113,78814,198651, 486784,1167337,2752166,6400283,14716576,33517185, 75712510,169810507,378463376,838772201,1849580902, 4059957771]