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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 39 |
| 4 | 161 |
| 5 | 677 |
| 6 | 2928 |
| 7 | 12960 |
| 8 | 58017 |
| 9 | 262405 |
| 10 | 1199539 |
| 11 | 5525169 |
| 12 | 25596413 |
| 13 | 119257971 |
| 14 | 558421159 |
| 15 | 2625162125 |
| 16 | 12385172472 |
| 17 | 58627444543 |
| 18 | 278328330444 |
| 19 | 1324693681144 |
| 20 | 6319734719386 |
| 21 | 30214893750138 |
| 22 | 144737543240666 |
| 23 | 694559665936562 |
| 24 | 3338525853202416 |
| 25 | 16071560266421005 |
| 26 | 77475630137792744 |
[1,3,10,39,161,677,2928,12960,58017,262405, 1199539,5525169,25596413,119257971,558421159, 2625162125,12385172472,58627444543,278328330444, 1324693681144,6319734719386,30214893750138, 144737543240666,694559665936562,3338525853202416, 16071560266421005,77475630137792744] |