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A007405 as a simple table

n a(n)
0 1
1 2
2 6
3 24
4 116
5 648
6 4088
7 28640
8 219920
9 1832224
10 16430176
11 157554048
12 1606879040
13 17350255744
14 197553645440
15 2363935624704
16 29638547505408
17 388328781668864
18 5304452565517824
19 75381218537805824
20 1112348880749130752
21 17014743624340539392
22 269360902955086379008

[1,2,6,24,116,648,4088,28640,219920,1832224,
 16430176,157554048,1606879040,17350255744,
 197553645440,2363935624704,29638547505408,
 388328781668864,5304452565517824,
 75381218537805824,1112348880749130752,
 17014743624340539392,269360902955086379008]

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Last modified April 15 20:40 EDT 2021. Contains 342977 sequences. (Running on oeis4.)