n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 34 |
6 | 206 |
7 | 1476 |
8 | 12123 |
9 | 111866 |
10 | 1143554 |
11 | 12816572 |
12 | 156217782 |
13 | 2057246164 |
14 | 29111150620 |
15 | 440565923336 |
16 | 7101696260883 |
17 | 121489909224618 |
18 | 2198572792193786 |
19 | 41966290373704332 |
20 | 842706170872913634 |
21 | 17759399688526009020 |
22 | 391929722837419044420 |
[1,1,1,2,7,34,206,1476,12123,111866,1143554, 12816572,156217782,2057246164,29111150620, 440565923336,7101696260883,121489909224618, 2198572792193786,41966290373704332, 842706170872913634,17759399688526009020, 391929722837419044420] |