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A170740 as a simple table

n a(n)
0 1
1 21
2 420
3 8400
4 168000
5 3360000
6 67200000
7 1344000000
8 26880000000
9 537600000000
10 10752000000000
11 215040000000000
12 4300800000000000
13 86016000000000000
14 1720320000000000000
15 34406400000000000000
16 688128000000000000000
17 13762560000000000000000
18 275251200000000000000000

[1,21,420,8400,168000,3360000,67200000,1344000000,
 26880000000,537600000000,10752000000000,
 215040000000000,4300800000000000,
 86016000000000000,1720320000000000000,
 34406400000000000000,688128000000000000000,
 13762560000000000000000,275251200000000000000000]

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Last modified April 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)