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A027809 as a simple table

n a(n)
9 715
10 11011
11 90090
12 520520
13 2382380
14 9189180
15 31039008
16 94225560
17 261891630
18 675745070
19 1636014380
20 3747960216
21 8180071900
22 17103786700
23 34420042800
24 66927861000
25 126159017985
26 231196390425
27 412918656150
28 720279159600
29 1229442013800
30 2056876004040

[715,11011,90090,520520,2382380,9189180,31039008,
 94225560,261891630,675745070,1636014380,
 3747960216,8180071900,17103786700,34420042800,
 66927861000,126159017985,231196390425,
 412918656150,720279159600,1229442013800,
 2056876004040]

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Last modified August 4 13:49 EDT 2020. Contains 336201 sequences. (Running on oeis4.)