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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 32 |
| 5 | 102 |
| 6 | 442 |
| 7 | 1608 |
| 8 | 7186 |
| 9 | 28334 |
| 10 | 129212 |
| 11 | 535710 |
| 12 | 2480758 |
| 13 | 10642688 |
| 14 | 49853972 |
| 15 | 219281189 |
| 16 | 1036152285 |
| 17 | 4644935059 |
| 18 | 22096999787 |
| 19 | 100542924803 |
| 20 | 480894907633 |
| 21 | 2214284711215 |
| 22 | 10637823281461 |
| 23 | 49458116493185 |
| 24 | 238483479012151 |
| 25 | 1117669034226221 |
| 26 | 5406149577305619 |
| 27 | 25506269301398852 |
[1,1,3,8,32,102,442,1608,7186,28334,129212,535710, 2480758,10642688,49853972,219281189,1036152285, 4644935059,22096999787,100542924803,480894907633, 2214284711215,10637823281461,49458116493185, 238483479012151,1117669034226221,5406149577305619, 25506269301398852] |