n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 15 |
5 | 232 |
6 | 3945 |
7 | 75197 |
8 | 1604974 |
9 | 38122542 |
10 | 1000354710 |
11 | 28790664534 |
12 | 902783451933 |
13 | 30658102047787 |
14 | 1121532291098765 |
15 | 43985781899812395 |
16 | 1841621373756094796 |
17 | 82002075703514947236 |
18 | 3869941339069299799884 |
19 | 192976569550677042208068 |
20 | 10139553075163838030949495 |
[0,0,0,1,15,232,3945,75197,1604974,38122542, 1000354710,28790664534,902783451933, 30658102047787,1121532291098765,43985781899812395, 1841621373756094796,82002075703514947236, 3869941339069299799884,192976569550677042208068, 10139553075163838030949495] |