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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 62 |
| 3 | 470 |
| 4 | 3506 |
| 5 | 25838 |
| 6 | 188642 |
| 7 | 1367150 |
| 8 | 9849986 |
| 9 | 70629518 |
| 10 | 504484322 |
| 11 | 3591856430 |
| 12 | 25505792066 |
| 13 | 180717326798 |
| 14 | 1278081981602 |
| 15 | 9024938035310 |
| 16 | 63644751231746 |
| 17 | 448334368529678 |
| 18 | 3155267239152482 |
| 19 | 22188430630735790 |
[1,8,62,470,3506,25838,188642,1367150,9849986, 70629518,504484322,3591856430,25505792066, 180717326798,1278081981602,9024938035310, 63644751231746,448334368529678,3155267239152482, 22188430630735790] |