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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 50 |
| 4 | 1349 |
| 5 | 194713 |
| 6 | 9917687 |
| 7 | 112451057 |
| 8 | 87707471002 |
| 9 | 638247495586258 |
| 10 | 39621419345255038 |
| 11 | 3367553690081394959018 |
| 12 | 293578866124447319211215128 |
| 13 | 340463591070905769538621961175104 |
| 14 | 403214792232827898020426758621769680732 |
| 15 | 16787247654077861265551571547714793328259156 |
[0,1,4,50,1349,194713,9917687,112451057, 87707471002,638247495586258,39621419345255038, 3367553690081394959018, 293578866124447319211215128, 340463591070905769538621961175104, 403214792232827898020426758621769680732, 16787247654077861265551571547714793328259156] |