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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 127 |
| 4 | 1810 |
| 5 | 27631 |
| 6 | 441604 |
| 7 | 7293700 |
| 8 | 123485914 |
| 9 | 2131511455 |
| 10 | 37368531010 |
| 11 | 663539143015 |
| 12 | 11908626395320 |
| 13 | 215670579863428 |
| 14 | 3936425910379840 |
| 15 | 72335601620713432 |
| 16 | 1337149262553687658 |
| 17 | 24847762997547701695 |
| 18 | 463900901255209923310 |
| 19 | 8697278488612398979645 |
[1,1,10,127,1810,27631,441604,7293700,123485914, 2131511455,37368531010,663539143015, 11908626395320,215670579863428,3936425910379840, 72335601620713432,1337149262553687658, 24847762997547701695,463900901255209923310, 8697278488612398979645] |