A098278 - OEIS

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A098278 as a simple table

n	a(n)
0	1
1	1
2	3
3	21
4	267
5	5349
6	154923
7	6120741
8	316271787
9	20701782309
10	1673934058923
11	163850823271461
12	19093313058395307
13	2611858473935397669
14	414452507370456337323
15	75508557963926980473381

[1,1,3,21,267,5349,154923,6120741,316271787, 20701782309,1673934058923,163850823271461, 19093313058395307,2611858473935397669, 414452507370456337323,75508557963926980473381]