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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 13 |
| 3 | 49 |
| 4 | 186 |
| 5 | 711 |
| 6 | 2749 |
| 7 | 10705 |
| 8 | 41946 |
| 9 | 165159 |
| 10 | 652765 |
| 11 | 2587441 |
| 12 | 10278906 |
| 13 | 40903047 |
| 14 | 162974461 |
| 15 | 649984657 |
| 16 | 2594199066 |
| 17 | 10359577575 |
| 18 | 41386654237 |
| 19 | 165391648753 |
| 20 | 661101690426 |
| 21 | 2643012047943 |
| 22 | 10567864050493 |
| 23 | 42258903778129 |
[1,3,13,49,186,711,2749,10705,41946,165159,652765, 2587441,10278906,40903047,162974461,649984657, 2594199066,10359577575,41386654237,165391648753, 661101690426,2643012047943,10567864050493, 42258903778129] |