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A001420 as a simple table
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 14 |
| 5 | 36 |
| 6 | 94 |
| 7 | 250 |
| 8 | 675 |
| 9 | 1838 |
| 10 | 5053 |
| 11 | 14016 |
| 12 | 39169 |
| 13 | 110194 |
| 14 | 311751 |
| 15 | 886160 |
| 16 | 2529260 |
| 17 | 7244862 |
| 18 | 20818498 |
| 19 | 59994514 |
| 20 | 173338962 |
| 21 | 501994070 |
| 22 | 1456891547 |
| 23 | 4236446214 |
| 24 | 12341035217 |
| 25 | 36009329450 |
| 26 | 105229462401 |
| 27 | 307942754342 |
| 28 | 902338712971 |
| 29 | 2647263986022 |
| 30 | 7775314024683 |
| 31 | 22861250676074 |
| 32 | 67284446545605 |
[2,3,6,14,36,94,250,675,1838,5053,14016,39169, 110194,311751,886160,2529260,7244862,20818498, 59994514,173338962,501994070,1456891547, 4236446214,12341035217,36009329450,105229462401, 307942754342,902338712971,2647263986022, 7775314024683,22861250676074,67284446545605] |