| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 10 |
| 5 | 18 |
| 6 | 30 |
| 7 | 60 |
| 8 | 108 |
| 9 | 180 |
| 10 | 360 |
| 11 | 720 |
| 12 | 1260 |
| 13 | 2520 |
| 14 | 5040 |
| 15 | 9240 |
| 16 | 17640 |
| 17 | 35280 |
| 18 | 65520 |
| 19 | 131040 |
| 20 | 257040 |
| 21 | 498960 |
| 22 | 982800 |
| 23 | 1884960 |
| 24 | 3603600 |
| 25 | 7207200 |
| 26 | 14414400 |
| 27 | 28274400 |
| 28 | 56548800 |
| 29 | 110270160 |
| 30 | 220540320 |
| 31 | 428828400 |
| 32 | 845404560 |
| 33 | 1690809120 |
[2,3,6,10,18,30,60,108,180,360,720,1260,2520,5040, 9240,17640,35280,65520,131040,257040,498960, 982800,1884960,3603600,7207200,14414400,28274400, 56548800,110270160,220540320,428828400,845404560, 1690809120] |