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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 49 |
| 3 | 322 |
| 4 | 1618 |
| 5 | 7119 |
| 6 | 28917 |
| 7 | 111360 |
| 8 | 412998 |
| 9 | 1490095 |
| 10 | 5266919 |
| 11 | 18329164 |
| 12 | 63032354 |
| 13 | 214788229 |
| 14 | 726753651 |
| 15 | 2445603148 |
| 16 | 8194841668 |
| 17 | 27369348241 |
| 18 | 91175639607 |
| 19 | 303133174298 |
| 20 | 1006289129240 |
| 21 | 3336552385073 |
| 22 | 11052905264953 |
| 23 | 36588907685926 |
| 24 | 121056347131508 |
[3,49,322,1618,7119,28917,111360,412998,1490095, 5266919,18329164,63032354,214788229,726753651, 2445603148,8194841668,27369348241,91175639607, 303133174298,1006289129240,3336552385073, 11052905264953,36588907685926,121056347131508] |