A098448 - OEIS

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A098448 as a simple table

n	a(n)
0	1
1	2
2	4
3	9
4	24
5	79
6	340
7	2090
8	20613
9	374593
10	14797043
11	1558788465
12	568317523370
13	1002992052280356
14	13173490079341336160
15	2227644152149802108130325
16	9740856579902962818887540217002

[1,2,4,9,24,79,340,2090,20613,374593,14797043, 1558788465,568317523370,1002992052280356, 13173490079341336160,2227644152149802108130325, 9740856579902962818887540217002]