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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 39 |
| 4 | 161 |
| 5 | 677 |
| 6 | 2944 |
| 7 | 13043 |
| 8 | 58346 |
| 9 | 264572 |
| 10 | 1210963 |
| 11 | 5575702 |
| 12 | 25857861 |
| 13 | 120582205 |
| 14 | 564582762 |
| 15 | 2655193678 |
| 16 | 12532838999 |
| 17 | 59328877385 |
| 18 | 281701560204 |
| 19 | 1341028983984 |
| 20 | 6397896935932 |
| 21 | 30590330691361 |
| 22 | 146545757482318 |
| 23 | 703235343882409 |
| 24 | 3380254025327490 |
| 25 | 16272430961904116 |
| 26 | 78441250955939205 |
[1,3,10,39,161,677,2944,13043,58346,264572, 1210963,5575702,25857861,120582205,564582762, 2655193678,12532838999,59328877385,281701560204, 1341028983984,6397896935932,30590330691361, 146545757482318,703235343882409,3380254025327490, 16272430961904116,78441250955939205] |