n | a(n) |
---|---|
1 | 3 |
2 | 8 |
3 | 21 |
4 | 54 |
5 | 185 |
6 | 552 |
7 | 1799 |
8 | 5900 |
9 | 19185 |
10 | 63834 |
11 | 210899 |
12 | 701724 |
13 | 2336721 |
14 | 7786742 |
15 | 25984043 |
16 | 86721124 |
17 | 289569291 |
18 | 967130226 |
19 | 3230474181 |
20 | 10792263708 |
21 | 36056118433 |
22 | 120467821634 |
23 | 402509354825 |
24 | 1344900626136 |
25 | 4493772713417 |
[3,8,21,54,185,552,1799,5900,19185,63834,210899, 701724,2336721,7786742,25984043,86721124, 289569291,967130226,3230474181,10792263708, 36056118433,120467821634,402509354825, 1344900626136,4493772713417] |