n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 16 |
5 | 65 |
6 | 456 |
7 | 3157 |
8 | 28624 |
9 | 276705 |
10 | 3136240 |
11 | 38531141 |
12 | 528468744 |
13 | 7837577761 |
14 | 126588882616 |
15 | 2194957583925 |
16 | 40854219413536 |
17 | 810192673705793 |
18 | 17082845929433952 |
19 | 381225135102420997 |
[0,0,2,3,16,65,456,3157,28624,276705,3136240, 38531141,528468744,7837577761,126588882616, 2194957583925,40854219413536,810192673705793, 17082845929433952,381225135102420997] |