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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 15 |
| 4 | 73 |
| 5 | 295 |
| 6 | 1453 |
| 7 | 6709 |
| 8 | 33727 |
| 9 | 166433 |
| 10 | 854781 |
| 11 | 4380061 |
| 12 | 22915615 |
| 13 | 120259717 |
| 14 | 638778193 |
| 15 | 3408006119 |
| 16 | 18324864455 |
| 17 | 98963982349 |
| 18 | 537422614247 |
| 19 | 2929848766089 |
| 20 | 16039760431783 |
| 21 | 88106400546275 |
| 22 | 485589372122359 |
| 23 | 2683957205776315 |
| 24 | 14875692005980127 |
| 25 | 82650245915910297 |
| 26 | 460275298623542575 |
[1,1,5,15,73,295,1453,6709,33727,166433,854781, 4380061,22915615,120259717,638778193,3408006119, 18324864455,98963982349,537422614247, 2929848766089,16039760431783,88106400546275, 485589372122359,2683957205776315, 14875692005980127,82650245915910297, 460275298623542575] |