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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 26 |
| 3 | 129 |
| 4 | 444 |
| 5 | 1285 |
| 6 | 3366 |
| 7 | 8281 |
| 8 | 19544 |
| 9 | 44829 |
| 10 | 100770 |
| 11 | 223201 |
| 12 | 488916 |
| 13 | 1061749 |
| 14 | 2289854 |
| 15 | 4910505 |
| 16 | 10480176 |
| 17 | 22275661 |
| 18 | 47178234 |
| 19 | 99605809 |
| 20 | 209704940 |
| 21 | 440390181 |
| 22 | 922733526 |
| 23 | 1929364729 |
| 24 | 4026514824 |
| 25 | 8388588925 |
| 26 | 17448283346 |
| 27 | 36238762881 |
| 28 | 75161901444 |
| 29 | 155692535509 |
| 30 | 322122515310 |
[1,26,129,444,1285,3366,8281,19544,44829,100770, 223201,488916,1061749,2289854,4910505,10480176, 22275661,47178234,99605809,209704940,440390181, 922733526,1929364729,4026514824,8388588925, 17448283346,36238762881,75161901444,155692535509, 322122515310] |