n | a(n) |
---|---|
2 | 1 |
3 | 5 |
4 | 21 |
5 | 83 |
6 | 319 |
7 | 1209 |
8 | 4550 |
9 | 17068 |
10 | 63954 |
11 | 239666 |
12 | 898909 |
13 | 3375825 |
14 | 12697035 |
15 | 47833905 |
16 | 180510210 |
17 | 682341000 |
18 | 2583591150 |
19 | 9798281910 |
20 | 37218303330 |
21 | 141585223494 |
22 | 539395269462 |
23 | 2057771255210 |
24 | 7860697923436 |
25 | 30065829471048 |
26 | 115135255095140 |
27 | 441410428339972 |
[1,5,21,83,319,1209,4550,17068,63954,239666, 898909,3375825,12697035,47833905,180510210, 682341000,2583591150,9798281910,37218303330, 141585223494,539395269462,2057771255210, 7860697923436,30065829471048,115135255095140, 441410428339972] |