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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 105 |
| 3 | 1170 |
| 4 | 13640 |
| 5 | 164502 |
| 6 | 2036265 |
| 7 | 25727800 |
| 8 | 330482295 |
| 9 | 4303216330 |
| 10 | 56672074888 |
| 11 | 753573733050 |
| 12 | 10103474312100 |
| 13 | 136435868978220 |
| 14 | 1854009194816745 |
| 15 | 25333847134998864 |
| 16 | 347880174736462550 |
| 17 | 4798137522234602700 |
| 18 | 66441427922465470095 |
| 19 | 923346006310186106010 |
| 20 | 12873823246049001482400 |
[1,10,105,1170,13640,164502,2036265,25727800, 330482295,4303216330,56672074888,753573733050, 10103474312100,136435868978220,1854009194816745, 25333847134998864,347880174736462550, 4798137522234602700,66441427922465470095, 923346006310186106010,12873823246049001482400] |