n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 24 |
6 | 91 |
7 | 354 |
8 | 1491 |
9 | 6504 |
10 | 29711 |
11 | 139616 |
12 | 674696 |
13 | 3328798 |
14 | 16730955 |
15 | 85382210 |
16 | 441571216 |
17 | 2310003732 |
18 | 12206975528 |
19 | 65082858008 |
20 | 349756996762 |
21 | 1892980028014 |
22 | 10310987833049 |
23 | 56489307860860 |
24 | 311112321625754 |
25 | 1721692801914844 |
26 | 9569930999155801 |
27 | 53410232801675436 |
[0,1,2,7,24,91,354,1491,6504,29711,139616,674696, 3328798,16730955,85382210,441571216,2310003732, 12206975528,65082858008,349756996762, 1892980028014,10310987833049,56489307860860, 311112321625754,1721692801914844,9569930999155801, 53410232801675436] |