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| n | a(n) |
|---|---|
| 1 | 272 |
| 2 | 24611 |
| 3 | 515086 |
| 4 | 4456448 |
| 5 | 23750912 |
| 6 | 93241002 |
| 7 | 296327464 |
| 8 | 806453248 |
| 9 | 1951153920 |
| 10 | 4300685074 |
| 11 | 8787223186 |
| 12 | 16878338048 |
| 13 | 30768878848 |
| 14 | 53624926972 |
| 15 | 89982082488 |
| 16 | 146028888064 |
| 17 | 230022888960 |
| 18 | 353194774434 |
| 19 | 529896144586 |
[272,24611,515086,4456448,23750912,93241002, 296327464,806453248,1951153920,4300685074, 8787223186,16878338048,30768878848,53624926972, 89982082488,146028888064,230022888960, 353194774434,529896144586] |