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| n | a(n) |
|---|---|
| 1 | 2247 |
| 2 | 15431 |
| 3 | 87529 |
| 4 | 444421 |
| 5 | 2067987 |
| 6 | 8976385 |
| 7 | 36809498 |
| 8 | 144007880 |
| 9 | 541598982 |
| 10 | 1969991292 |
| 11 | 6964460154 |
| 12 | 24028268136 |
| 13 | 81182285391 |
| 14 | 269383972831 |
| 15 | 880117983928 |
| 16 | 2837311053260 |
| 17 | 9042403815092 |
| 18 | 28535164299486 |
| 19 | 89292416423582 |
[2247,15431,87529,444421,2067987,8976385,36809498, 144007880,541598982,1969991292,6964460154, 24028268136,81182285391,269383972831,880117983928, 2837311053260,9042403815092,28535164299486, 89292416423582] |