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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 31 |
| 2 | 155 |
| 3 | 546 |
| 4 | 1554 |
| 5 | 3823 |
| 6 | 8451 |
| 7 | 17205 |
| 8 | 32802 |
| 9 | 59268 |
| 10 | 102388 |
| 11 | 170261 |
| 12 | 273975 |
| 13 | 428418 |
| 14 | 653242 |
| 15 | 973998 |
| 16 | 1423461 |
| 17 | 2043165 |
| 18 | 2885169 |
| 19 | 4014076 |
| 20 | 5509328 |
| 21 | 7467801 |
| 22 | 10006725 |
| 23 | 13266955 |
| 24 | 17416620 |
| 25 | 22655178 |
| 26 | 29217906 |
[3,31,155,546,1554,3823,8451,17205,32802,59268, 102388,170261,273975,428418,653242,973998,1423461, 2043165,2885169,4014076,5509328,7467801,10006725, 13266955,17416620,22655178,29217906] |