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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 10 |
| 5 | 16 |
| 6 | 40 |
| 7 | 100 |
| 8 | 631 |
| 9 | 1000 |
| 10 | 1585 |
| 11 | 2512 |
| 12 | 10000 |
| 13 | 15849 |
| 14 | 25119 |
| 15 | 100000 |
| 16 | 1000000 |
| 17 | 10000000 |
| 18 | 15848932 |
| 19 | 100000000 |
| 20 | 1000000000 |
| 21 | 6309573445 |
| 22 | 10000000000 |
| 23 | 100000000000 |
| 24 | 251188643151 |
| 25 | 1000000000000 |
| 26 | 3981071705535 |
| 27 | 6309573444802 |
| 28 | 10000000000000 |
[0,1,4,10,16,40,100,631,1000,1585,2512,10000, 15849,25119,100000,1000000,10000000,15848932, 100000000,1000000000,6309573445,10000000000, 100000000000,251188643151,1000000000000, 3981071705535,6309573444802,10000000000000] |