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| n | a(n) |
|---|---|
| 1 | 21016 |
| 2 | 31060 |
| 3 | 53512 |
| 4 | 105604 |
| 5 | 231736 |
| 6 | 551380 |
| 7 | 1398952 |
| 8 | 3743524 |
| 9 | 10479256 |
| 10 | 30483700 |
| 11 | 91664392 |
| 12 | 283832644 |
| 13 | 902755576 |
| 14 | 2945024020 |
| 15 | 9845481832 |
| 16 | 33704772964 |
| 17 | 118040932696 |
| 18 | 422335788340 |
| 19 | 1540872323272 |
| 20 | 5720102724484 |
| 21 | 21554302962616 |
[21016,31060,53512,105604,231736,551380,1398952, 3743524,10479256,30483700,91664392,283832644, 902755576,2945024020,9845481832,33704772964, 118040932696,422335788340,1540872323272, 5720102724484,21554302962616] |