A270015 - OEIS

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A270015 as a simple table

n	a(n)
0	1
1	4
2	32
3	200
4	856
5	3456
6	14237
7	57017
8	227453
9	902076
10	3603545
11	14407088
12	57545481
13	230103709
14	920198901
15	3679932897

[1,4,32,200,856,3456,14237,57017,227453,902076, 3603545,14407088,57545481,230103709,920198901, 3679932897]