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A007228 as a simple table

n a(n)
0 3
1 6
2 28
3 165
4 1092
5 7752
6 57684
7 444015
8 3506100
9 28242984
10 231180144
11 1917334783
12 16077354108
13 136074334200
14 1160946392760
15 9973891723635
16 86210635955220
17 749191930237608
18 6541908910355280
19 57369142749576660
20 505045163173167760
21 4461713825057817120

[3,6,28,165,1092,7752,57684,444015,3506100,
 28242984,231180144,1917334783,16077354108,
 136074334200,1160946392760,9973891723635,
 86210635955220,749191930237608,6541908910355280,
 57369142749576660,505045163173167760,
 4461713825057817120]

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Last modified April 23 02:15 EDT 2019. Contains 322380 sequences. (Running on oeis4.)