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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 32 |
| 4 | 140 |
| 5 | 610 |
| 6 | 2756 |
| 7 | 12514 |
| 8 | 57848 |
| 9 | 268436 |
| 10 | 1257928 |
| 11 | 5915546 |
| 12 | 27991248 |
| 13 | 132843454 |
| 14 | 633110652 |
| 15 | 3024787472 |
| 16 | 14495342620 |
| 17 | 69608204042 |
| 18 | 335037749148 |
| 19 | 1615403739132 |
| 20 | 7802947707912 |
| 21 | 37746275219340 |
| 22 | 182865537439992 |
| 23 | 887020568383374 |
| 24 | 4307942307676976 |
| 25 | 20944703634327626 |
| 26 | 101936878569261388 |
[1,2,8,32,140,610,2756,12514,57848,268436,1257928, 5915546,27991248,132843454,633110652,3024787472, 14495342620,69608204042,335037749148, 1615403739132,7802947707912,37746275219340, 182865537439992,887020568383374,4307942307676976, 20944703634327626,101936878569261388] |