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A205773 as a simple table

n a(n)
0 1
1 3
2 21
3 156
4 1335
5 12153
6 116778
7 1160715
8 11848530
9 123420648
10 1306709841
11 14019657771
12 152092615971
13 1665531792021
14 18386262679557
15 204393214435791
16 2286101345820933
17 25708109998131381
18 290490321604346535
19 3296566844230833750
20 37555644504960139647

[1,3,21,156,1335,12153,116778,1160715,11848530,
 123420648,1306709841,14019657771,152092615971,
 1665531792021,18386262679557,204393214435791,
 2286101345820933,25708109998131381,
 290490321604346535,3296566844230833750,
 37555644504960139647]

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Last modified December 6 03:07 EST 2023. Contains 367594 sequences. (Running on oeis4.)