A069732 - OEIS

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A069732 as a simple table

n	a(n)
1	0
2	0
3	2
4	7
5	40
6	239
7	1549
8	10396
9	71467
10	498598
11	3520015
12	25087426
13	180249182
14	1304148015
15	9494015372
16	69492950976
17	511147940104
18	3776180492129
19	28007532925171
20	208474866181148

[0,0,2,7,40,239,1549,10396,71467,498598,3520015, 25087426,180249182,1304148015,9494015372, 69492950976,511147940104,3776180492129, 28007532925171,208474866181148]