A273247 - OEIS

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A273247 as a simple table

n	a(n)
0	1
1	4
2	29
3	152
4	696
5	3008
6	12552
7	51432
8	207592
9	833000
10	3340028
11	13364284
12	53499372
13	214105632
14	856510780
15	3426475304

[1,4,29,152,696,3008,12552,51432,207592,833000, 3340028,13364284,53499372,214105632,856510780, 3426475304]