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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 15 |
| 3 | 279 |
| 4 | 5729 |
| 5 | 124554 |
| 6 | 2810718 |
| 7 | 65114402 |
| 8 | 1538182398 |
| 9 | 36887880105 |
| 10 | 895303119303 |
| 11 | 21943398532563 |
| 12 | 542209373589501 |
| 13 | 13489931811324550 |
| 14 | 337599511395854298 |
| 15 | 8491805574767197650 |
| 16 | 214548940430198454054 |
| 17 | 5441921826542937659088 |
| 18 | 138512110164878076019560 |
[0,1,15,279,5729,124554,2810718,65114402, 1538182398,36887880105,895303119303, 21943398532563,542209373589501,13489931811324550, 337599511395854298,8491805574767197650, 214548940430198454054,5441921826542937659088, 138512110164878076019560] |