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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 12 |
| 3 | 56 |
| 4 | 342 |
| 5 | 992 |
| 6 | 16256 |
| 7 | 17822 |
| 8 | 169332 |
| 9 | 628056 |
| 10 | 1189190 |
| 11 | 2720850 |
| 12 | 11085570 |
| 13 | 35599122 |
| 14 | 67100672 |
| 15 | 1147210770 |
| 16 | 1317435912 |
| 17 | 1707135806 |
| 18 | 7800334080 |
| 19 | 11208986256 |
| 20 | 13366943840 |
| 21 | 17109032402 |
| 22 | 17179738112 |
| 23 | 46343540900 |
| 24 | 58413331032 |
| 25 | 83717924940 |
| 26 | 204574837700 |
| 27 | 274877382656 |
| 28 | 445968192672 |
| 29 | 589130699852 |
[2,12,56,342,992,16256,17822,169332,628056, 1189190,2720850,11085570,35599122,67100672, 1147210770,1317435912,1707135806,7800334080, 11208986256,13366943840,17109032402,17179738112, 46343540900,58413331032,83717924940,204574837700, 274877382656,445968192672,589130699852] |