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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 6 |
| 5 | 25 |
| 6 | 93 |
| 7 | 324 |
| 8 | 1088 |
| 9 | 3565 |
| 10 | 11487 |
| 11 | 36564 |
| 12 | 115327 |
| 13 | 361194 |
| 14 | 1124932 |
| 15 | 3487857 |
| 16 | 10774350 |
| 17 | 33181365 |
| 18 | 101924727 |
| 19 | 312402600 |
| 20 | 955728009 |
| 21 | 2919095808 |
| 22 | 8903220174 |
| 23 | 27121002621 |
| 24 | 82525328253 |
| 25 | 250867833102 |
| 26 | 761946207338 |
| 27 | 2312406692839 |
| 28 | 7012910929818 |
| 29 | 21254741084817 |
| 30 | 64381661704933 |
[1,6,25,93,324,1088,3565,11487,36564,115327, 361194,1124932,3487857,10774350,33181365, 101924727,312402600,955728009,2919095808, 8903220174,27121002621,82525328253,250867833102, 761946207338,2312406692839,7012910929818, 21254741084817,64381661704933] |