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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 9 |
| 5 | 9 |
| 6 | 41 |
| 7 | 105 |
| 8 | 233 |
| 9 | 489 |
| 10 | 489 |
| 11 | 1513 |
| 12 | 3561 |
| 13 | 7657 |
| 14 | 15849 |
| 15 | 32233 |
| 16 | 32233 |
| 17 | 97769 |
| 18 | 228841 |
| 19 | 490985 |
| 20 | 1015273 |
| 21 | 2063849 |
| 22 | 4161001 |
| 23 | 8355305 |
| 24 | 16743913 |
| 25 | 16743913 |
| 26 | 16743913 |
| 27 | 83852777 |
| 28 | 218070505 |
| 29 | 218070505 |
| 30 | 218070505 |
| 31 | 1291812329 |
| 32 | 1291812329 |
| 33 | 5586779625 |
| 34 | 5586779625 |
| 35 | 5586779625 |
[0,1,1,1,9,9,41,105,233,489,489,1513,3561,7657, 15849,32233,32233,97769,228841,490985,1015273, 2063849,4161001,8355305,16743913,16743913, 16743913,83852777,218070505,218070505,218070505, 1291812329,1291812329,5586779625,5586779625, 5586779625] |