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| n | a(n) |
|---|---|
| 1 | 17800 |
| 2 | 77618 |
| 3 | 267066 |
| 4 | 916658 |
| 5 | 3191760 |
| 6 | 11082632 |
| 7 | 38569884 |
| 8 | 134316050 |
| 9 | 467816690 |
| 10 | 1629405698 |
| 11 | 5667390680 |
| 12 | 19715419592 |
| 13 | 68594753068 |
| 14 | 238634097858 |
| 15 | 830238632478 |
| 16 | 2888535915458 |
| 17 | 10050627740076 |
| 18 | 34970754257408 |
| 19 | 121674300182928 |
[17800,77618,267066,916658,3191760,11082632, 38569884,134316050,467816690,1629405698, 5667390680,19715419592,68594753068,238634097858, 830238632478,2888535915458,10050627740076, 34970754257408,121674300182928] |