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A183476 as a simple table

n a(n)
1 3
2 15
3 39
4 135
5 495
6 1647
7 5751
8 20223
9 70119
10 244863
11 855927
12 2985903
13 10426887
14 36416223
15 127148535
16 444006927
17 1550518119
18 5414352255
19 18907098327
20 66024403695
21 230558764743
22 805118884191
23 2811503074743
24 9817858453455

[3,15,39,135,495,1647,5751,20223,70119,244863,
 855927,2985903,10426887,36416223,127148535,
 444006927,1550518119,5414352255,18907098327,
 66024403695,230558764743,805118884191,
 2811503074743,9817858453455]

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Last modified October 17 16:06 EDT 2021. Contains 348065 sequences. (Running on oeis4.)