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A037773 as a simple table

n a(n)
1 3
2 16
3 80
4 402
5 2013
6 10066
7 50330
8 251652
9 1258263
10 6291316
11 31456580
12 157282902
13 786414513
14 3932072566
15 19660362830
16 98301814152
17 491509070763
18 2457545353816
19 12287726769080
20 61438633845402
21 307193169227013

[3,16,80,402,2013,10066,50330,251652,1258263,
 6291316,31456580,157282902,786414513,3932072566,
 19660362830,98301814152,491509070763,
 2457545353816,12287726769080,61438633845402,
 307193169227013]

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Last modified April 21 07:53 EDT 2019. Contains 322327 sequences. (Running on oeis4.)