A253478 - OEIS

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A253478 as a simple table

n	a(n)
1	558
2	6804
3	85280
4	1066300
5	13347930
6	166986430
7	2089637292
8	26146542588
9	327171117860
10	4093826224868
11	51225496342820
12	640976478054436
13	8020442466701434
14	100358565951977392
15	1255771461301697900

[558,6804,85280,1066300,13347930,166986430, 2089637292,26146542588,327171117860,4093826224868, 51225496342820,640976478054436,8020442466701434, 100358565951977392,1255771461301697900]