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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 12 |
| 5 | 24 |
| 6 | 54 |
| 7 | 117 |
| 8 | 247 |
| 9 | 532 |
| 10 | 1148 |
| 11 | 2460 |
| 12 | 5280 |
| 13 | 11352 |
| 14 | 24381 |
| 15 | 52353 |
| 16 | 112462 |
| 17 | 241570 |
| 18 | 518840 |
| 19 | 1114416 |
| 20 | 2393694 |
| 21 | 5141385 |
| 22 | 11043135 |
| 23 | 23719608 |
| 24 | 50947336 |
| 25 | 109429624 |
| 26 | 235043840 |
| 27 | 504850560 |
| 28 | 1084367865 |
| 29 | 2329112625 |
| 30 | 5002699050 |
| 31 | 10745292366 |
| 32 | 23079802756 |
| 33 | 49573086472 |
[1,1,2,6,12,24,54,117,247,532,1148,2460,5280, 11352,24381,52353,112462,241570,518840,1114416, 2393694,5141385,11043135,23719608,50947336, 109429624,235043840,504850560,1084367865, 2329112625,5002699050,10745292366,23079802756, 49573086472] |