A079820 - OEIS

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A079820 as a simple table

n	a(n)
0	1
1	5
2	20
3	79
4	306
5	1185
6	4550
7	17240
8	64582
9	236713
10	841951
11	2825790
12	7998476
13	14330740
14	11028854
15	2546648
16	19660

[1,5,20,79,306,1185,4550,17240,64582,236713, 841951,2825790,7998476,14330740,11028854,2546648, 19660]