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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 11 |
| 5 | 59 |
| 6 | 179 |
| 7 | 1259 |
| 8 | 2519 |
| 9 | 7559 |
| 10 | 37799 |
| 11 | 415799 |
| 12 | 1247399 |
| 13 | 16216199 |
| 14 | 113513399 |
| 15 | 567566999 |
| 16 | 1135133999 |
| 17 | 19297277999 |
| 18 | 57891833999 |
| 19 | 1099944845999 |
| 20 | 5499724229999 |
| 21 | 38498069609999 |
| 22 | 423478765709999 |
| 23 | 9740011611329999 |
[0,1,5,11,59,179,1259,2519,7559,37799,415799, 1247399,16216199,113513399,567566999,1135133999, 19297277999,57891833999,1099944845999, 5499724229999,38498069609999,423478765709999, 9740011611329999] |