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| n | a(n) |
|---|---|
| 1 | 50 |
| 2 | 984 |
| 3 | 8854 |
| 4 | 58814 |
| 5 | 324702 |
| 6 | 1557606 |
| 7 | 6643979 |
| 8 | 25596389 |
| 9 | 90177585 |
| 10 | 293585050 |
| 11 | 891208427 |
| 12 | 2542007013 |
| 13 | 6857916671 |
| 14 | 17598839738 |
| 15 | 43168340844 |
| 16 | 101638636169 |
| 17 | 230538577645 |
| 18 | 505352928460 |
| 19 | 1073534755140 |
| 20 | 2215475595868 |
| 21 | 4451276849868 |
[50,984,8854,58814,324702,1557606,6643979, 25596389,90177585,293585050,891208427,2542007013, 6857916671,17598839738,43168340844,101638636169, 230538577645,505352928460,1073534755140, 2215475595868,4451276849868] |