A073373 - OEIS

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A073373 as a simple table

n	a(n)
0	1
1	4
2	18
3	60
4	195
5	576
6	1644
7	4488
8	11925
9	30860
10	78278
11	195012
12	478599
13	1159080
14	2774880
15	6575280
16	15439065
17	35955540
18	83118970
19	190862860
20	435601611
21	988620624
22	2232236628
23	5016441240
24	11224087965

[1,4,18,60,195,576,1644,4488,11925,30860,78278, 195012,478599,1159080,2774880,6575280,15439065, 35955540,83118970,190862860,435601611,988620624, 2232236628,5016441240,11224087965]