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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 7 |
| 2 | 15 |
| 3 | 54 |
| 4 | 91 |
| 5 | 329 |
| 6 | 714 |
| 7 | 2583 |
| 8 | 4183 |
| 9 | 15134 |
| 10 | 32853 |
| 11 | 118863 |
| 12 | 200690 |
| 13 | 726103 |
| 14 | 1576239 |
| 15 | 5702886 |
| 16 | 9227467 |
| 17 | 33385289 |
| 18 | 72473466 |
| 19 | 262211463 |
| 20 | 442721993 |
| 21 | 1601783218 |
| 22 | 3477183675 |
| 23 | 12580568721 |
| 24 | 20374242722 |
| 25 | 73714702663 |
[2,7,15,54,91,329,714,2583,4183,15134,32853, 118863,200690,726103,1576239,5702886,9227467, 33385289,72473466,262211463,442721993,1601783218, 3477183675,12580568721,20374242722,73714702663] |