n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 13 |
5 | 106 |
6 | 601 |
7 | 7456 |
8 | 60649 |
9 | 1012348 |
10 | 10748161 |
11 | 225641296 |
12 | 2957978101 |
13 | 74847384184 |
14 | 1168123938073 |
15 | 34598428916416 |
16 | 626497273410961 |
17 | 21261683280971536 |
18 | 438222313050326209 |
19 | 16765636110497697088 |
20 | 387549609831150094621 |
21 | 16502188154766906299296 |
[1,1,1,4,13,106,601,7456,60649,1012348,10748161, 225641296,2957978101,74847384184,1168123938073, 34598428916416,626497273410961,21261683280971536, 438222313050326209,16765636110497697088, 387549609831150094621,16502188154766906299296] |