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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 16 |
| 6 | 44 |
| 7 | 106 |
| 8 | 273 |
| 9 | 672 |
| 10 | 1696 |
| 11 | 4214 |
| 12 | 10573 |
| 13 | 26392 |
| 14 | 66151 |
| 15 | 165578 |
| 16 | 415277 |
| 17 | 1041480 |
| 18 | 2615004 |
| 19 | 6568450 |
| 20 | 16512355 |
| 21 | 41531360 |
| 22 | 104526093 |
| 23 | 263206638 |
| 24 | 663143211 |
| 25 | 1671581968 |
| 26 | 4215574482 |
| 27 | 10635988422 |
| 28 | 26846320149 |
| 29 | 67790042264 |
[1,2,7,16,44,106,273,672,1696,4214,10573,26392, 66151,165578,415277,1041480,2615004,6568450, 16512355,41531360,104526093,263206638,663143211, 1671581968,4215574482,10635988422,26846320149, 67790042264] |