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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 65 |
| 4 | 1394 |
| 5 | 40378 |
| 6 | 1470972 |
| 7 | 64575585 |
| 8 | 3315911300 |
| 9 | 194921240846 |
| 10 | 12905391110105 |
| 11 | 950172113032181 |
| 12 | 77000666619646717 |
| 13 | 6810514097879311450 |
| 14 | 652810277600420281734 |
| 15 | 67407087759052608218945 |
| 16 | 7459157975936646185855880 |
| 17 | 880616251774021869817185430 |
[1,1,5,65,1394,40378,1470972,64575585,3315911300, 194921240846,12905391110105,950172113032181, 77000666619646717,6810514097879311450, 652810277600420281734,67407087759052608218945, 7459157975936646185855880, 880616251774021869817185430] |