A028844 - OEIS

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A028844 as a simple table

n	a(n)
1	1
2	6
3	71
4	1261
5	29906
6	887751
7	31657851
8	1318279586
9	62783681421
10	3365947782611
11	200610405843926
12	13157941480889921
13	941848076798467801
14	73060842413607398806
15	6105266987293752470991
16	546770299628690541571901

[1,6,71,1261,29906,887751,31657851,1318279586, 62783681421,3365947782611,200610405843926, 13157941480889921,941848076798467801, 73060842413607398806,6105266987293752470991, 546770299628690541571901]