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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 22 |
| 5 | 46 |
| 6 | 118 |
| 7 | 206 |
| 8 | 278 |
| 9 | 558 |
| 10 | 1654 |
| 11 | 3790 |
| 12 | 5910 |
| 13 | 11310 |
| 14 | 28790 |
| 15 | 49358 |
| 16 | 65814 |
| 17 | 131630 |
| 18 | 394870 |
| 19 | 921294 |
| 20 | 1447702 |
| 21 | 3025966 |
| 22 | 7762038 |
| 23 | 13549774 |
| 24 | 18284822 |
| 25 | 36438574 |
| 26 | 108004982 |
| 27 | 247467726 |
| 28 | 385881878 |
| 29 | 738208814 |
| 30 | 1879076982 |
| 31 | 3221274830 |
[1,2,6,14,22,46,118,206,278,558,1654,3790,5910, 11310,28790,49358,65814,131630,394870,921294, 1447702,3025966,7762038,13549774,18284822, 36438574,108004982,247467726,385881878,738208814, 1879076982,3221274830] |