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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 20 |
| 3 | 36 |
| 4 | 67 |
| 5 | 148 |
| 6 | 343 |
| 7 | 817 |
| 8 | 1975 |
| 9 | 4788 |
| 10 | 11644 |
| 11 | 28327 |
| 12 | 68949 |
| 13 | 167840 |
| 14 | 408591 |
| 15 | 994711 |
| 16 | 2421617 |
| 17 | 5895464 |
| 18 | 14352589 |
| 19 | 34941627 |
| 20 | 85066013 |
| 21 | 207094729 |
| 22 | 504175889 |
| 23 | 1227425339 |
| 24 | 2988189330 |
| 25 | 7274801283 |
| 26 | 17710636103 |
| 27 | 43116865936 |
| 28 | 104968794797 |
[8,20,36,67,148,343,817,1975,4788,11644,28327, 68949,167840,408591,994711,2421617,5895464, 14352589,34941627,85066013,207094729,504175889, 1227425339,2988189330,7274801283,17710636103, 43116865936,104968794797] |