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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 166 |
| 4 | 1934 |
| 5 | 24076 |
| 6 | 312900 |
| 7 | 4191528 |
| 8 | 57424848 |
| 9 | 800511928 |
| 10 | 11314617512 |
| 11 | 161736519334 |
| 12 | 2333709074866 |
| 13 | 33940921354676 |
| 14 | 496985854805560 |
| 15 | 7320036386083320 |
| 16 | 108370564070861790 |
| 17 | 1611667048718909412 |
| 18 | 24065028942496468872 |
| 19 | 360628842425757805380 |
[1,2,16,166,1934,24076,312900,4191528,57424848, 800511928,11314617512,161736519334,2333709074866, 33940921354676,496985854805560,7320036386083320, 108370564070861790,1611667048718909412, 24065028942496468872,360628842425757805380] |