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A099250 as a simple table

n a(n)
0 1
1 4
2 21
3 127
4 835
5 5798
6 41835
7 310572
8 2356779
9 18199284
10 142547559
11 1129760415
12 9043402501
13 73007772802
14 593742784829
15 4859761676391
16 40002464776083
17 330931069469828
18 2750016719520991
19 22944749046030949
20 192137918101841817

[1,4,21,127,835,5798,41835,310572,2356779,
 18199284,142547559,1129760415,9043402501,
 73007772802,593742784829,4859761676391,
 40002464776083,330931069469828,2750016719520991,
 22944749046030949,192137918101841817]

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Last modified October 16 13:12 EDT 2018. Contains 316263 sequences. (Running on oeis4.)