n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 15 |
3 | 39 |
4 | 99 |
5 | 255 |
6 | 651 |
7 | 1671 |
8 | 4275 |
9 | 10959 |
10 | 28059 |
11 | 71895 |
12 | 184131 |
13 | 471711 |
14 | 1208235 |
15 | 3095079 |
16 | 7928019 |
17 | 20308335 |
18 | 52020411 |
19 | 133253751 |
20 | 341335395 |
21 | 874350399 |
22 | 2239691979 |
23 | 5737093575 |
24 | 14695861491 |
25 | 37644235791 |
26 | 96427681755 |
27 | 247004624919 |
28 | 632715351939 |
29 | 1620733851615 |
[1,6,15,39,99,255,651,1671,4275,10959,28059,71895, 184131,471711,1208235,3095079,7928019,20308335, 52020411,133253751,341335395,874350399,2239691979, 5737093575,14695861491,37644235791,96427681755, 247004624919,632715351939,1620733851615] |