A185764 - OEIS

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A185764 as a simple table

n	a(n)
1	264
2	1128
3	5272
4	24832
5	118248
6	562800
7	2680000
8	12760448
9	60758008
10	289298976
11	1377475600
12	6558823720
13	31229466280
14	148698094888
15	708018868272
16	3371204831376
17	16051843045856
18	76430201410000
19	363919139999024

[264,1128,5272,24832,118248,562800,2680000, 12760448,60758008,289298976,1377475600,6558823720, 31229466280,148698094888,708018868272, 3371204831376,16051843045856,76430201410000, 363919139999024]