n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 9 |
4 | 48 |
5 | 315 |
6 | 2497 |
7 | 23394 |
8 | 254132 |
9 | 3149826 |
10 | 43945354 |
11 | 682314028 |
12 | 11676044036 |
13 | 218402171520 |
14 | 4433885571840 |
15 | 97098961376112 |
16 | 2281563329170752 |
17 | 57255174735315792 |
18 | 1528204674443305680 |
19 | 43227315891291907488 |
20 | 1291646719998952196448 |
21 | 40652195494651491747840 |
[0,0,2,9,48,315,2497,23394,254132,3149826, 43945354,682314028,11676044036,218402171520, 4433885571840,97098961376112,2281563329170752, 57255174735315792,1528204674443305680, 43227315891291907488,1291646719998952196448, 40652195494651491747840] |