A131765 - OEIS

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A131765 as a simple table

n	a(n)
0	1
1	4
2	36
3	404
4	5076
5	68324
6	963396
7	14046964
8	210062196
9	3204118724
10	49656709476
11	779690085204
12	12376867734036
13	198301332087204
14	3202580085625476
15	52080967814444724
16	852103170531254196
17	14016301507253656964

[1,4,36,404,5076,68324,963396,14046964,210062196, 3204118724,49656709476,779690085204, 12376867734036,198301332087204,3202580085625476, 52080967814444724,852103170531254196, 14016301507253656964]