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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 12 |
| 5 | 30 |
| 6 | 68 |
| 7 | 144 |
| 8 | 289 |
| 9 | 556 |
| 10 | 1034 |
| 11 | 1868 |
| 12 | 3292 |
| 13 | 5678 |
| 14 | 9608 |
| 15 | 15984 |
| 16 | 26188 |
| 17 | 42314 |
| 18 | 67509 |
| 19 | 106460 |
| 20 | 166090 |
| 21 | 256552 |
| 22 | 392628 |
| 23 | 595696 |
| 24 | 896484 |
| 25 | 1338894 |
| 26 | 1985298 |
| 27 | 2923840 |
| 28 | 4278448 |
| 29 | 6222518 |
| 30 | 8997544 |
| 31 | 12938368 |
| 32 | 18507297 |
| 33 | 26340040 |
| 34 | 37307326 |
| 35 | 52597320 |
| 36 | 73825504 |
| 37 | 103180702 |
[1,4,12,30,68,144,289,556,1034,1868,3292,5678, 9608,15984,26188,42314,67509,106460,166090,256552, 392628,595696,896484,1338894,1985298,2923840, 4278448,6222518,8997544,12938368,18507297, 26340040,37307326,52597320,73825504,103180702] |