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A304701 as a simple table

n a(n)
1 3
2 51
3 46
4 215
5 908
6 5232
7 19701
8 135455
9 872954
10 4460213
11 28861276
12 182319313
13 1043954782
14 6559780616
15 40608072614
16 242771829978
17 1502847915709
18 9234685790042
19 56064025371157
20 344833181614977
21 2113754951173744

[3,51,46,215,908,5232,19701,135455,872954,4460213,
 28861276,182319313,1043954782,6559780616,
 40608072614,242771829978,1502847915709,
 9234685790042,56064025371157,344833181614977,
 2113754951173744]

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Last modified October 16 03:37 EDT 2019. Contains 328040 sequences. (Running on oeis4.)