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| n | a(n) |
|---|---|
| 1 | 216 |
| 2 | 2802 |
| 3 | 28240 |
| 4 | 172888 |
| 5 | 822348 |
| 6 | 2865126 |
| 7 | 8902860 |
| 8 | 23177368 |
| 9 | 55906496 |
| 10 | 122921570 |
| 11 | 254998668 |
| 12 | 492803174 |
| 13 | 916912140 |
| 14 | 1618570176 |
| 15 | 2775224082 |
| 16 | 4580364152 |
| 17 | 7372967710 |
| 18 | 11513855042 |
| 19 | 17636594106 |
| 20 | 26371506592 |
| 21 | 38792087628 |
[216,2802,28240,172888,822348,2865126,8902860, 23177368,55906496,122921570,254998668,492803174, 916912140,1618570176,2775224082,4580364152, 7372967710,11513855042,17636594106,26371506592, 38792087628] |