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| n | a(n) |
|---|---|
| 1 | 48 |
| 2 | 306 |
| 3 | 1484 |
| 4 | 6086 |
| 5 | 22712 |
| 6 | 80874 |
| 7 | 280918 |
| 8 | 968918 |
| 9 | 3331390 |
| 10 | 11529150 |
| 11 | 40039718 |
| 12 | 140472370 |
| 13 | 495086118 |
| 14 | 1762513772 |
| 15 | 6298664834 |
| 16 | 22708461010 |
| 17 | 82096862576 |
| 18 | 299009175572 |
| 19 | 1091067476376 |
| 20 | 4005899379338 |
| 21 | 14725718137608 |
| 22 | 54410699363212 |
[48,306,1484,6086,22712,80874,280918,968918, 3331390,11529150,40039718,140472370,495086118, 1762513772,6298664834,22708461010,82096862576, 299009175572,1091067476376,4005899379338, 14725718137608,54410699363212] |