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| n | a(n) |
|---|---|
| 1 | 90 |
| 2 | 499 |
| 3 | 2166 |
| 4 | 8667 |
| 5 | 31942 |
| 6 | 111916 |
| 7 | 376415 |
| 8 | 1228141 |
| 9 | 3911718 |
| 10 | 12225055 |
| 11 | 37629475 |
| 12 | 114415963 |
| 13 | 344453875 |
| 14 | 1028640925 |
| 15 | 3051602949 |
| 16 | 9004181108 |
| 17 | 26450597561 |
| 18 | 77418965194 |
| 19 | 225924263865 |
| 20 | 657679624225 |
| 21 | 1910701827288 |
| 22 | 5541861127364 |
[90,499,2166,8667,31942,111916,376415,1228141, 3911718,12225055,37629475,114415963,344453875, 1028640925,3051602949,9004181108,26450597561, 77418965194,225924263865,657679624225, 1910701827288,5541861127364] |