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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 35 |
| 5 | 122 |
| 6 | 465 |
| 7 | 1832 |
| 8 | 7295 |
| 9 | 29142 |
| 10 | 116525 |
| 11 | 466052 |
| 12 | 1864155 |
| 13 | 7456562 |
| 14 | 29826185 |
| 15 | 119304672 |
| 16 | 477218615 |
| 17 | 1908874382 |
| 18 | 7635497445 |
| 19 | 30541989692 |
| 20 | 122167958675 |
| 21 | 488671834602 |
| 22 | 1954687338305 |
| 23 | 7818749353112 |
| 24 | 31274997412335 |
| 25 | 125099989649222 |
| 26 | 500399958596765 |
[0,2,5,12,35,122,465,1832,7295,29142,116525, 466052,1864155,7456562,29826185,119304672, 477218615,1908874382,7635497445,30541989692, 122167958675,488671834602,1954687338305, 7818749353112,31274997412335,125099989649222, 500399958596765] |