A011838 - OEIS

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A011838 as a simple table

n	a(n)
1	1
2	2
3	10
4	131
5	4203
6	331201
7	64663638
8	31352026159
9	37776715520590
10	113247016996007525
11	846271790301299050986
12	15805460204542771053508658
13	740016466929577536283427715626

[1,2,10,131,4203,331201,64663638,31352026159, 37776715520590,113247016996007525, 846271790301299050986,15805460204542771053508658, 740016466929577536283427715626]