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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 50 |
| 3 | 144 |
| 4 | 398 |
| 5 | 1076 |
| 6 | 2866 |
| 7 | 7560 |
| 8 | 19798 |
| 9 | 51580 |
| 10 | 133850 |
| 11 | 346320 |
| 12 | 894014 |
| 13 | 2303876 |
| 14 | 5929090 |
| 15 | 15242904 |
| 16 | 39155878 |
| 17 | 100520716 |
| 18 | 257930666 |
| 19 | 661586400 |
| 20 | 1696454798 |
| 21 | 4349091860 |
| 22 | 11147493970 |
| 23 | 28569027240 |
| 24 | 73209334774 |
| 25 | 187586107036 |
[16,50,144,398,1076,2866,7560,19798,51580,133850, 346320,894014,2303876,5929090,15242904,39155878, 100520716,257930666,661586400,1696454798, 4349091860,11147493970,28569027240,73209334774, 187586107036] |