A070075 - OEIS

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A070075 as a simple table

n	a(n)
0	1
1	2
2	9
3	57
4	464
5	4593
6	53381
7	711056
8	10665071
9	177698377
10	3253933294
11	64917524367
12	1400923403957
13	32503510579738
14	806599849548101
15	21313355891736741
16	597326671763101944

[1,2,9,57,464,4593,53381,711056,10665071, 177698377,3253933294,64917524367,1400923403957, 32503510579738,806599849548101,21313355891736741, 597326671763101944]