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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 71 |
| 3 | 514 |
| 4 | 3838 |
| 5 | 28486 |
| 6 | 212060 |
| 7 | 1578180 |
| 8 | 11748804 |
| 9 | 87465304 |
| 10 | 651171800 |
| 11 | 4847955288 |
| 12 | 36093104816 |
| 13 | 268714229264 |
| 14 | 2000587354768 |
| 15 | 14894452176096 |
| 16 | 110889806477664 |
| 17 | 825579209354848 |
| 18 | 6146471657514944 |
| 19 | 45760738536130624 |
[9,71,514,3838,28486,212060,1578180,11748804, 87465304,651171800,4847955288,36093104816, 268714229264,2000587354768,14894452176096, 110889806477664,825579209354848,6146471657514944, 45760738536130624] |