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A150153 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 20 |
| 4 | 74 |
| 5 | 286 |
| 6 | 1156 |
| 7 | 4802 |
| 8 | 20424 |
| 9 | 88416 |
| 10 | 388558 |
| 11 | 1728154 |
| 12 | 7766068 |
| 13 | 35203756 |
| 14 | 160780734 |
| 15 | 739100904 |
| 16 | 3417064694 |
| 17 | 15877515930 |
| 18 | 74106064750 |
| 19 | 347262568828 |
| 20 | 1633119402146 |
| 21 | 7705187224014 |
| 22 | 36460485042190 |
| 23 | 172989825363820 |
| 24 | 822769665651888 |
| 25 | 3921997461962730 |
| 26 | 18733952939668598 |
| 27 | 89655251453676982 |
[1,2,6,20,74,286,1156,4802,20424,88416,388558, 1728154,7766068,35203756,160780734,739100904, 3417064694,15877515930,74106064750,347262568828, 1633119402146,7705187224014,36460485042190, 172989825363820,822769665651888,3921997461962730, 18733952939668598,89655251453676982] |