A158257 - OEIS

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A158257 as a simple table

n	a(n)
0	1
1	1
2	2
3	7
4	44
5	458
6	7953
7	225761
8	10470604
9	789302962
10	96596105976
11	19162936947418
12	6158621106553275
13	3204835468356347519
14	2699695571885775547222
15	3680716263445262350996413

[1,1,2,7,44,458,7953,225761,10470604,789302962, 96596105976,19162936947418,6158621106553275, 3204835468356347519,2699695571885775547222, 3680716263445262350996413]