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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 14 |
| 3 | 170 |
| 4 | 3000 |
| 5 | 69930 |
| 6 | 2033212 |
| 7 | 70972734 |
| 8 | 2894590064 |
| 9 | 135164076722 |
| 10 | 7113787010100 |
| 11 | 416759006663142 |
| 12 | 26903080612468744 |
| 13 | 1897553477118350922 |
| 14 | 145204649027247413996 |
| 15 | 11982094054396851014030 |
| 16 | 1060673494236770414806752 |
| 17 | 100265097180082772515691874 |
| 18 | 10080871201186661027182272868 |
[1,2,14,170,3000,69930,2033212,70972734, 2894590064,135164076722,7113787010100, 416759006663142,26903080612468744, 1897553477118350922,145204649027247413996, 11982094054396851014030,1060673494236770414806752, 100265097180082772515691874, 10080871201186661027182272868] |