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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 36 |
| 3 | 603 |
| 4 | 11745 |
| 5 | 249372 |
| 6 | 5599044 |
| 7 | 130735620 |
| 8 | 3142426428 |
| 9 | 77238209502 |
| 10 | 1932396279066 |
| 11 | 49047725266101 |
| 12 | 1259884849971465 |
| 13 | 32690034127387431 |
| 14 | 855528520866461010 |
| 15 | 22556952666651901761 |
| 16 | 598607836414445357145 |
| 17 | 15976563963437863357146 |
[1,3,36,603,11745,249372,5599044,130735620, 3142426428,77238209502,1932396279066, 49047725266101,1259884849971465,32690034127387431, 855528520866461010,22556952666651901761, 598607836414445357145,15976563963437863357146] |