n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 17 |
3 | 76 |
4 | 354 |
5 | 1704 |
6 | 8421 |
7 | 42508 |
8 | 218318 |
9 | 1137400 |
10 | 5996938 |
11 | 31940792 |
12 | 171605956 |
13 | 928931280 |
14 | 5061593709 |
15 | 27739833228 |
16 | 152809506582 |
17 | 845646470616 |
18 | 4699126915422 |
19 | 26209721959656 |
20 | 146681521121244 |
21 | 823429928805936 |
[1,4,17,76,354,1704,8421,42508,218318,1137400, 5996938,31940792,171605956,928931280,5061593709, 27739833228,152809506582,845646470616, 4699126915422,26209721959656,146681521121244, 823429928805936] |