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A223370 as a simple table

n a(n)
1 21
2 90
3 90
4 420
5 990
6 420
7 1992
8 11610
9 11610
10 1992
11 9552
12 139158
13 357354
14 139158
15 9552
16 45984
17 1686042
18 11206806
19 11206806
20 1686042
21 45984
22 221760
23 20537766
24 356391222
25 933306108
26 356391222
27 20537766
28 221760
29 1070208
30 250834914

[21,90,90,420,990,420,1992,11610,11610,1992,9552,
 139158,357354,139158,9552,45984,1686042,11206806,
 11206806,1686042,45984,221760,20537766,356391222,
 933306108,356391222,20537766,221760,1070208,
 250834914]

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Last modified January 26 22:05 EST 2022. Contains 350601 sequences. (Running on oeis4.)