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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 0 |
| 2 | 3 |
| 3 | 1 |
| 4 | 8 |
| 5 | 8 |
| 6 | 28 |
| 7 | 43 |
| 8 | 111 |
| 9 | 204 |
| 10 | 466 |
| 11 | 924 |
| 12 | 2007 |
| 13 | 4109 |
| 14 | 8740 |
| 15 | 18136 |
| 16 | 38240 |
| 17 | 79799 |
| 18 | 167643 |
| 19 | 350664 |
| 20 | 735554 |
| 21 | 1540104 |
| 22 | 3228459 |
| 23 | 6762553 |
| 24 | 14172272 |
| 25 | 29691368 |
| 26 | 62217172 |
| 27 | 130356451 |
| 28 | 273144327 |
| 29 | 572305140 |
| 30 | 1199164498 |
| 31 | 2512579140 |
| 32 | 5264623167 |
| 33 | 11030890949 |
[2,0,3,1,8,8,28,43,111,204,466,924,2007,4109,8740, 18136,38240,79799,167643,350664,735554,1540104, 3228459,6762553,14172272,29691368,62217172, 130356451,273144327,572305140,1199164498, 2512579140,5264623167,11030890949] |