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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 14 |
| 3 | 93 |
| 4 | 256 |
| 5 | 1793 |
| 6 | 4872 |
| 7 | 34107 |
| 8 | 92590 |
| 9 | 648154 |
| 10 | 1759313 |
| 11 | 12315269 |
| 12 | 33427272 |
| 13 | 233991155 |
| 14 | 635119194 |
| 15 | 4445835138 |
| 16 | 12067267861 |
| 17 | 84470877438 |
| 18 | 229278099157 |
| 19 | 1604946701532 |
| 20 | 4356283914175 |
| 21 | 30493987422124 |
| 22 | 82769394462323 |
| 23 | 579385761306789 |
| 24 | 1572618495070552 |
[4,14,93,256,1793,4872,34107,92590,648154,1759313, 12315269,33427272,233991155,635119194,4445835138, 12067267861,84470877438,229278099157, 1604946701532,4356283914175,30493987422124, 82769394462323,579385761306789,1572618495070552] |