A067657 - OEIS

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A067657 as a simple table

n	a(n)
1	3
2	11
3	137
4	761
5	7129
6	18858053
7	34395742267
8	85691034670497533
9	252476961434436524654789
10	928551009361054917576341971
11	42409610330030873613929048033
12	4868007055309996043055960217131137

[3,11,137,761,7129,18858053,34395742267, 85691034670497533,252476961434436524654789, 928551009361054917576341971, 42409610330030873613929048033, 4868007055309996043055960217131137]