n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 4 |
3 | 2 |
4 | 46 |
5 | 221 |
6 | 1627 |
7 | 11312 |
8 | 83704 |
9 | 631433 |
10 | 4868920 |
11 | 38137757 |
12 | 302694082 |
13 | 2428593929 |
14 | 19664122513 |
15 | 160464212831 |
16 | 1318266144163 |
17 | 10893680220326 |
18 | 90486907158265 |
19 | 755060334587576 |
20 | 6326283013232206 |
21 | 53199259567645709 |
22 | 448846559987031064 |
[1,-1,4,2,46,221,1627,11312,83704,631433,4868920, 38137757,302694082,2428593929,19664122513, 160464212831,1318266144163,10893680220326, 90486907158265,755060334587576,6326283013232206, 53199259567645709,448846559987031064] |