n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 21 |
4 | 148 |
5 | 1365 |
6 | 15966 |
7 | 229411 |
8 | 3932440 |
9 | 78438681 |
10 | 1784386810 |
11 | 45565679511 |
12 | 1289796524820 |
13 | 40065439945141 |
14 | 1354630932486118 |
15 | 49512390012682395 |
16 | 1945119744809765296 |
17 | 81728227537432878513 |
18 | 3657019655412488345202 |
19 | 173610723750748520091679 |
[0,1,4,21,148,1365,15966,229411,3932440,78438681, 1784386810,45565679511,1289796524820, 40065439945141,1354630932486118,49512390012682395, 1945119744809765296,81728227537432878513, 3657019655412488345202,173610723750748520091679] |