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A047819 as a simple table

n a(n)
0 1
1 20
2 175
3 980
4 4116
5 14112
6 41580
7 108900
8 259545
9 572572
10 1184183
11 2318680
12 4331600
13 7768320
14 13441968
15 22535064
16 36729945
17 58373700
18 90684055
19 138003404
20 206108980
21 302588000
22 437287500
23 622849500
24 875343105
25 1215006156
26 1667110095

[1,20,175,980,4116,14112,41580,108900,259545,
 572572,1184183,2318680,4331600,7768320,13441968,
 22535064,36729945,58373700,90684055,138003404,
 206108980,302588000,437287500,622849500,875343105,
 1215006156,1667110095]

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Last modified May 9 17:14 EDT 2024. Contains 372354 sequences. (Running on oeis4.)