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A275567 as a simple table

n a(n)
1 6
2 216
3 504
4 1176
5 3192
6 8664
7 23712
8 64896
9 180960
10 504600
11 1418100
12 3985350
13 11202990
14 31492086
15 88441764
16 248378136
17 697381260
18 1958065350
19 5498516310
20 15440588646
21 43363859406
22 121784495766
23 342029032494
24 960580887846

[6,216,504,1176,3192,8664,23712,64896,180960,
 504600,1418100,3985350,11202990,31492086,88441764,
 248378136,697381260,1958065350,5498516310,
 15440588646,43363859406,121784495766,342029032494,
 960580887846]

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Last modified November 29 12:16 EST 2020. Contains 338766 sequences. (Running on oeis4.)