n | a(n) |
---|---|
0 | 3 |
1 | 15 |
2 | 72 |
3 | 345 |
4 | 1653 |
5 | 7920 |
6 | 37947 |
7 | 181815 |
8 | 871128 |
9 | 4173825 |
10 | 19997997 |
11 | 95816160 |
12 | 459082803 |
13 | 2199597855 |
14 | 10538906472 |
15 | 50494934505 |
16 | 241935766053 |
17 | 1159183895760 |
18 | 5553983712747 |
19 | 26610734667975 |
20 | 127499689627128 |
21 | 610887713467665 |
22 | 2926938877711197 |
23 | 14023806675088320 |
[3,15,72,345,1653,7920,37947,181815,871128, 4173825,19997997,95816160,459082803,2199597855, 10538906472,50494934505,241935766053, 1159183895760,5553983712747,26610734667975, 127499689627128,610887713467665,2926938877711197, 14023806675088320] |