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| n | a(n) |
|---|---|
| 1 | 548 |
| 2 | 31577 |
| 3 | 300304 |
| 4 | 2141609 |
| 5 | 7972932 |
| 6 | 26526337 |
| 7 | 67596992 |
| 8 | 161991665 |
| 9 | 335832580 |
| 10 | 669329801 |
| 11 | 1217929488 |
| 12 | 2155659097 |
| 13 | 3584230244 |
| 14 | 5837790449 |
| 15 | 9084731392 |
| 16 | 13912683617 |
| 17 | 20579766372 |
| 18 | 30053056825 |
| 19 | 42704873360 |
| 20 | 60046213001 |
| 21 | 82587911428 |
[548,31577,300304,2141609,7972932,26526337, 67596992,161991665,335832580,669329801,1217929488, 2155659097,3584230244,5837790449,9084731392, 13912683617,20579766372,30053056825,42704873360, 60046213001,82587911428] |