| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 10 |
| 6 | 18 |
| 7 | 28 |
| 8 | 80 |
| 9 | 162 |
| 10 | 280 |
| 11 | 880 |
| 12 | 1944 |
| 13 | 3640 |
| 14 | 12320 |
| 15 | 29160 |
| 16 | 58240 |
| 17 | 209440 |
| 18 | 524880 |
| 19 | 1106560 |
| 20 | 4188800 |
| 21 | 11022480 |
| 22 | 24344320 |
| 23 | 96342400 |
| 24 | 264539520 |
| 25 | 608608000 |
| 26 | 2504902400 |
| 27 | 7142567040 |
| 28 | 17041024000 |
| 29 | 72642169600 |
| 30 | 214277011200 |
| 31 | 528271744000 |
| 32 | 2324549427200 |
[1,1,2,3,4,10,18,28,80,162,280,880,1944,3640, 12320,29160,58240,209440,524880,1106560,4188800, 11022480,24344320,96342400,264539520,608608000, 2504902400,7142567040,17041024000,72642169600, 214277011200,528271744000,2324549427200] |