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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 19 |
| 6 | 47 |
| 7 | 114 |
| 8 | 286 |
| 9 | 723 |
| 10 | 1869 |
| 11 | 4870 |
| 12 | 12943 |
| 13 | 34662 |
| 14 | 94055 |
| 15 | 257397 |
| 16 | 712102 |
| 17 | 1983341 |
| 18 | 5574561 |
| 19 | 15767323 |
| 20 | 44933781 |
| 21 | 128791036 |
| 22 | 371525354 |
| 23 | 1077236361 |
| 24 | 3141339436 |
| 25 | 9203555415 |
| 26 | 27098848505 |
| 27 | 80132017267 |
| 28 | 238015965927 |
| 29 | 709753560742 |
| 30 | 2125009380084 |
| 31 | 6385306592457 |
[1,3,8,19,47,114,286,723,1869,4870,12943,34662, 94055,257397,712102,1983341,5574561,15767323, 44933781,128791036,371525354,1077236361, 3141339436,9203555415,27098848505,80132017267, 238015965927,709753560742,2125009380084, 6385306592457] |