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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 20 |
| 3 | 75 |
| 4 | 314 |
| 5 | 1283 |
| 6 | 5311 |
| 7 | 21803 |
| 8 | 89640 |
| 9 | 369032 |
| 10 | 1517961 |
| 11 | 6244222 |
| 12 | 25688677 |
| 13 | 105682189 |
| 14 | 434759457 |
| 15 | 1788546806 |
| 16 | 7357898836 |
| 17 | 30269531965 |
| 18 | 124525282462 |
| 19 | 512282735741 |
| 20 | 2107472161705 |
| 21 | 8669896311631 |
| 22 | 35666951338042 |
| 23 | 146729718668682 |
[4,20,75,314,1283,5311,21803,89640,369032,1517961, 6244222,25688677,105682189,434759457,1788546806, 7357898836,30269531965,124525282462,512282735741, 2107472161705,8669896311631,35666951338042, 146729718668682] |