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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 175 |
| 3 | 1650 |
| 4 | 14481 |
| 5 | 122316 |
| 6 | 1010995 |
| 7 | 8250550 |
| 8 | 66817861 |
| 9 | 538611216 |
| 10 | 4329233415 |
| 11 | 34735589850 |
| 12 | 278393339641 |
| 13 | 2229689837716 |
| 14 | 17850234337435 |
| 15 | 142865452943550 |
| 16 | 1143241514899821 |
| 17 | 9147521576217816 |
| 18 | 73188119895363055 |
[1,16,175,1650,14481,122316,1010995,8250550, 66817861,538611216,4329233415,34735589850, 278393339641,2229689837716,17850234337435, 142865452943550,1143241514899821,9147521576217816, 73188119895363055] |