n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 45 |
3 | 975 |
4 | 3465 |
5 | 25047 |
6 | 471669 |
7 | 1542519 |
8 | 8361540 |
9 | 43916950 |
10 | 934748298 |
11 | 2560160538 |
12 | 12924414750 |
13 | 52656337800 |
14 | 271075650210 |
15 | 5853558884496 |
16 | 14764118156523 |
17 | 65116959410547 |
18 | 241547985000289 |
19 | 1004388404964615 |
20 | 4276652360222781 |
21 | 104392134731727315 |
[1,9,45,975,3465,25047,471669,1542519,8361540, 43916950,934748298,2560160538,12924414750, 52656337800,271075650210,5853558884496, 14764118156523,65116959410547,241547985000289, 1004388404964615,4276652360222781, 104392134731727315] |