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A240437 as a simple table

n a(n)
1 0
2 20
3 100
4 600
5 3000
6 15500
7 77500
8 390000
9 1950000
10 9762500
11 48812500
12 244125000
13 1220625000
14 6103437500
15 30517187500
16 152587500000
17 762937500000
18 3814695312500
19 19073476562500
20 95367421875000
21 476837109375000
22 2384185742187500
23 11920928710937500
24 59604644531250000
25 298023222656250000

[0,20,100,600,3000,15500,77500,390000,1950000,
 9762500,48812500,244125000,1220625000,6103437500,
 30517187500,152587500000,762937500000,
 3814695312500,19073476562500,95367421875000,
 476837109375000,2384185742187500,
 11920928710937500,59604644531250000,
 298023222656250000]

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Last modified March 1 02:43 EST 2021. Contains 341732 sequences. (Running on oeis4.)