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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 11 |
| 3 | 34 |
| 4 | 26 |
| 5 | 67 |
| 6 | 150 |
| 7 | 1485 |
| 8 | 2497 |
| 9 | 8001 |
| 10 | 2773 |
| 11 | 16668 |
| 12 | 39567 |
| 13 | 80705 |
| 14 | 15643 |
| 15 | 19267 |
| 16 | 29310 |
| 17 | 223602 |
| 18 | 2318795 |
| 19 | 9376463 |
| 20 | 7972671 |
| 21 | 2412975 |
| 22 | 3754694 |
| 23 | 9560425 |
| 24 | 1910435 |
[0,4,11,34,26,67,150,1485,2497,8001,2773,16668, 39567,80705,15643,19267,29310,223602,2318795, 9376463,7972671,2412975,3754694,9560425,1910435] |