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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 21 |
| 5 | 51 |
| 6 | 111 |
| 7 | 321 |
| 8 | 741 |
| 9 | 2001 |
| 10 | 4311 |
| 11 | 8931 |
| 12 | 22791 |
| 13 | 52821 |
| 14 | 112881 |
| 15 | 293061 |
| 16 | 803571 |
| 17 | 1824591 |
| 18 | 4887651 |
| 19 | 14587341 |
| 20 | 33986721 |
| 21 | 92184861 |
| 22 | 208581141 |
| 23 | 431674011 |
| 24 | 877859751 |
| 25 | 2216416971 |
| 26 | 4893531411 |
| 27 | 11363224641 |
| 28 | 24302611101 |
| 29 | 63120770481 |
| 30 | 140757089241 |
| 31 | 341317579371 |
| 32 | 742438559631 |
| 33 | 1945801500411 |
| 34 | 4352527381971 |
| 35 | 11773265516781 |
[0,1,3,9,21,51,111,321,741,2001,4311,8931,22791, 52821,112881,293061,803571,1824591,4887651, 14587341,33986721,92184861,208581141,431674011, 877859751,2216416971,4893531411,11363224641, 24302611101,63120770481,140757089241,341317579371, 742438559631,1945801500411,4352527381971, 11773265516781] |