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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 10 |
| 3 | 105 |
| 4 | 1264 |
| 5 | 15418 |
| 6 | 188465 |
| 7 | 2304141 |
| 8 | 28171070 |
| 9 | 344428103 |
| 10 | 4211086174 |
| 11 | 51486063258 |
| 12 | 629484802987 |
| 13 | 7696279187803 |
| 14 | 94097130028610 |
| 15 | 1150461107685501 |
| 16 | 14065899352150196 |
| 17 | 171974109566120666 |
| 18 | 2102609553831755149 |
[2,10,105,1264,15418,188465,2304141,28171070, 344428103,4211086174,51486063258,629484802987, 7696279187803,94097130028610,1150461107685501, 14065899352150196,171974109566120666, 2102609553831755149] |