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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 57 |
| 3 | 250 |
| 4 | 958 |
| 5 | 3422 |
| 6 | 11759 |
| 7 | 39416 |
| 8 | 129700 |
| 9 | 420542 |
| 10 | 1347449 |
| 11 | 4275770 |
| 12 | 13460154 |
| 13 | 42089400 |
| 14 | 130860258 |
| 15 | 404848066 |
| 16 | 1247092849 |
| 17 | 3826948536 |
| 18 | 11704162210 |
| 19 | 35687710162 |
| 20 | 108522683624 |
| 21 | 329199712980 |
| 22 | 996399154254 |
| 23 | 3009727674010 |
| 24 | 9074343647823 |
| 25 | 27312573390012 |
[1,10,57,250,958,3422,11759,39416,129700,420542, 1347449,4275770,13460154,42089400,130860258, 404848066,1247092849,3826948536,11704162210, 35687710162,108522683624,329199712980, 996399154254,3009727674010,9074343647823, 27312573390012] |