The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 10 |
| 2 | 300 |
| 3 | 4500 |
| 4 | 50000 |
| 5 | 468750 |
| 6 | 3937500 |
| 7 | 30625000 |
| 8 | 225000000 |
| 9 | 1582031250 |
| 10 | 10742187500 |
| 11 | 70898437500 |
| 12 | 457031250000 |
| 13 | 2888183593750 |
| 14 | 17944335937500 |
| 15 | 109863281250000 |
| 16 | 664062500000000 |
| 17 | 3968811035156250 |
| 18 | 23483276367187500 |
[0,10,300,4500,50000,468750,3937500,30625000, 225000000,1582031250,10742187500,70898437500, 457031250000,2888183593750,17944335937500, 109863281250000,664062500000000,3968811035156250, 23483276367187500] |