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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 8 |
| 6 | 23 |
| 7 | 71 |
| 8 | 193 |
| 9 | 490 |
| 10 | 1221 |
| 11 | 3011 |
| 12 | 7393 |
| 13 | 18025 |
| 14 | 43847 |
| 15 | 106206 |
| 16 | 256851 |
| 17 | 619642 |
| 18 | 1493272 |
| 19 | 3593527 |
| 20 | 8641624 |
| 21 | 20764212 |
| 22 | 49869733 |
| 23 | 119716469 |
| 24 | 287306693 |
| 25 | 689316717 |
| 26 | 1653539600 |
| 27 | 3965895220 |
| 28 | 9510880953 |
| 29 | 22806565004 |
| 30 | 54685294862 |
| 31 | 131116579494 |
| 32 | 314360235644 |
[1,3,8,23,71,193,490,1221,3011,7393,18025,43847, 106206,256851,619642,1493272,3593527,8641624, 20764212,49869733,119716469,287306693,689316717, 1653539600,3965895220,9510880953,22806565004, 54685294862,131116579494,314360235644] |