n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 23 |
6 | 89 |
7 | 230 |
8 | 552 |
9 | 1555 |
10 | 4206 |
11 | 11450 |
12 | 31045 |
13 | 85225 |
14 | 232290 |
15 | 634516 |
16 | 1734730 |
17 | 4739435 |
18 | 12951941 |
19 | 35393508 |
20 | 96729068 |
21 | 264330479 |
22 | 722375126 |
23 | 1974121998 |
24 | 5394894605 |
25 | 14743271893 |
26 | 40290668634 |
27 | 110107068086 |
28 | 300902363502 |
[1,2,6,18,23,89,230,552,1555,4206,11450,31045, 85225,232290,634516,1734730,4739435,12951941, 35393508,96729068,264330479,722375126,1974121998, 5394894605,14743271893,40290668634,110107068086, 300902363502] |