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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 6435 |
| 3 | 381333 |
| 4 | 5068915 |
| 5 | 33563481 |
| 6 | 148733571 |
| 7 | 507709165 |
| 8 | 1443039123 |
| 9 | 3581326065 |
| 10 | 8006545891 |
| 11 | 16475259141 |
| 12 | 31690921395 |
| 13 | 57644499913 |
| 14 | 100028603715 |
| 15 | 166732334301 |
| 16 | 268424064211 |
| 17 | 419229350625 |
| 18 | 637511191203 |
| 19 | 946759829365 |
| 20 | 1376599316211 |
| 21 | 1963918036281 |
[0,1,6435,381333,5068915,33563481,148733571, 507709165,1443039123,3581326065,8006545891, 16475259141,31690921395,57644499913,100028603715, 166732334301,268424064211,419229350625, 637511191203,946759829365,1376599316211, 1963918036281] |