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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 11 |
| 6 | 29 |
| 7 | 77 |
| 8 | 202 |
| 9 | 532 |
| 10 | 1395 |
| 11 | 3664 |
| 12 | 9605 |
| 13 | 25192 |
| 14 | 66047 |
| 15 | 173183 |
| 16 | 453998 |
| 17 | 1190259 |
| 18 | 3120294 |
| 19 | 8180124 |
| 20 | 21444290 |
| 21 | 56217025 |
| 22 | 147373441 |
| 23 | 386342414 |
| 24 | 1012799936 |
| 25 | 2655067412 |
| 26 | 6960281083 |
| 27 | 18246444362 |
| 28 | 47833200849 |
| 29 | 125395149294 |
| 30 | 328724391241 |
| 31 | 861753701567 |
| 32 | 2259094233704 |
[1,1,2,4,11,29,77,202,532,1395,3664,9605,25192, 66047,173183,453998,1190259,3120294,8180124, 21444290,56217025,147373441,386342414,1012799936, 2655067412,6960281083,18246444362,47833200849, 125395149294,328724391241,861753701567, 2259094233704] |