n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 7 |
3 | 42 |
4 | 246 |
5 | 1435 |
6 | 8365 |
7 | 48756 |
8 | 284172 |
9 | 1656277 |
10 | 9653491 |
11 | 56264670 |
12 | 327934530 |
13 | 1911342511 |
14 | 11140120537 |
15 | 64929380712 |
16 | 378436163736 |
17 | 2205687601705 |
18 | 12855689446495 |
19 | 74928449077266 |
20 | 436715005017102 |
21 | 2545361581025347 |
22 | 14835454481134981 |
23 | 86467365305784540 |
[0,1,7,42,246,1435,8365,48756,284172,1656277, 9653491,56264670,327934530,1911342511,11140120537, 64929380712,378436163736,2205687601705, 12855689446495,74928449077266,436715005017102, 2545361581025347,14835454481134981, 86467365305784540] |