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A006153 as a simple table

n a(n)
0 1
1 1
2 4
3 21
4 148
5 1305
6 13806
7 170401
8 2403640
9 38143377
10 672552730
11 13044463641
12 276003553860
13 6326524990825
14 156171026562838
15 4130464801497105
16 116526877671782896
17 3492868475952497313
18 110856698175372359346
19 3713836169709782989993

[1,1,4,21,148,1305,13806,170401,2403640,38143377,
 672552730,13044463641,276003553860,6326524990825,
 156171026562838,4130464801497105,
 116526877671782896,3492868475952497313,
 110856698175372359346,3713836169709782989993]

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Last modified December 3 06:42 EST 2016. Contains 278698 sequences.