n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 19 |
6 | 68 |
7 | 236 |
8 | 863 |
9 | 3137 |
10 | 11636 |
11 | 43306 |
12 | 162728 |
13 | 614142 |
14 | 2330454 |
15 | 8875656 |
16 | 33924699 |
17 | 130038017 |
18 | 499753560 |
19 | 1924912505 |
20 | 7429159770 |
21 | 28723877046 |
22 | 111236422377 |
23 | 431403469046 |
24 | 1675316533812 |
25 | 6513837677642 |
26 | 25354842098354 |
27 | 98794053266471 |
28 | 385312558567775 |
[1,1,2,6,19,68,236,863,3137,11636,43306,162728, 614142,2330454,8875656,33924699,130038017, 499753560,1924912505,7429159770,28723877046, 111236422377,431403469046,1675316533812, 6513837677642,25354842098354,98794053266471, 385312558567775] |