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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 63 |
| 3 | 728 |
| 4 | 4095 |
| 5 | 15624 |
| 6 | 46655 |
| 7 | 117648 |
| 8 | 262143 |
| 9 | 531440 |
| 10 | 999999 |
| 11 | 1771560 |
| 12 | 2985983 |
| 13 | 4826808 |
| 14 | 7529535 |
| 15 | 11390624 |
| 16 | 16777215 |
| 17 | 24137568 |
| 18 | 34012223 |
| 19 | 47045880 |
| 20 | 63999999 |
| 21 | 85766120 |
| 22 | 113379903 |
| 23 | 148035888 |
| 24 | 191102975 |
| 25 | 244140624 |
| 26 | 308915775 |
| 27 | 387420488 |
[0,63,728,4095,15624,46655,117648,262143,531440, 999999,1771560,2985983,4826808,7529535,11390624, 16777215,24137568,34012223,47045880,63999999, 85766120,113379903,148035888,191102975,244140624, 308915775,387420488] |