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| n | a(n) |
|---|---|
| 20 | 3 |
| 21 | 15 |
| 22 | 70 |
| 23 | 256 |
| 24 | 884 |
| 25 | 2840 |
| 26 | 8788 |
| 27 | 26238 |
| 28 | 76511 |
| 29 | 218462 |
| 30 | 614003 |
| 31 | 1702291 |
| 32 | 4667792 |
| 33 | 12678438 |
| 34 | 34163511 |
| 35 | 91424125 |
| 36 | 243210889 |
| 37 | 643652954 |
| 38 | 1695711086 |
| 39 | 4449529462 |
| 40 | 11634279616 |
| 41 | 30324707572 |
| 42 | 78819222196 |
| 43 | 204348623105 |
| 44 | 528597552113 |
| 45 | 1364545143938 |
| 46 | 3515960193715 |
[3,15,70,256,884,2840,8788,26238,76511,218462, 614003,1702291,4667792,12678438,34163511,91424125, 243210889,643652954,1695711086,4449529462, 11634279616,30324707572,78819222196,204348623105, 528597552113,1364545143938,3515960193715] |