A272013 - OEIS

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A272013 as a simple table

n	a(n)
0	1
1	5
2	21
3	52
4	220
5	976
6	4136
7	18000
8	73957
9	300993
10	1210516
11	4852608
12	19444664
13	77863692
14	311433032
15	1245969964

[1,5,21,52,220,976,4136,18000,73957,300993, 1210516,4852608,19444664,77863692,311433032, 1245969964]