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A006531 as a simple table

n a(n)
0 1
1 1
2 3
3 19
4 183
5 2371
6 38703
7 763099
8 17648823
9 468603091
10 14050842303
11 469643495179
12 17315795469063
13 698171064855811
14 30561156525545103
15 1443380517590979259
16 73161586346500098903
17 3961555049961803092531
18 228225249142441259147103
19 13938493569348563803135339

[1,1,3,19,183,2371,38703,763099,17648823,
 468603091,14050842303,469643495179,17315795469063,
 698171064855811,30561156525545103,
 1443380517590979259,73161586346500098903,
 3961555049961803092531,228225249142441259147103,
 13938493569348563803135339]

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Last modified February 20 02:07 EST 2018. Contains 299357 sequences. (Running on oeis4.)