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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 2 |
| 6 | 2 |
| 7 | 4 |
| 8 | 6 |
| 9 | 10 |
| 10 | 18 |
| 11 | 28 |
| 12 | 46 |
| 13 | 74 |
| 14 | 114 |
| 15 | 184 |
| 16 | 286 |
| 17 | 448 |
| 18 | 700 |
| 19 | 1080 |
| 20 | 1676 |
| 21 | 2582 |
| 22 | 3970 |
| 23 | 6104 |
| 24 | 9338 |
| 25 | 14288 |
| 26 | 21808 |
| 27 | 33224 |
| 28 | 50580 |
| 29 | 76844 |
| 30 | 116640 |
| 31 | 176832 |
| 32 | 267740 |
| 33 | 405058 |
| 34 | 612110 |
| 35 | 924204 |
| 36 | 1394266 |
| 37 | 2101558 |
| 38 | 3165406 |
| 39 | 4764184 |
| 40 | 7165530 |
| 41 | 10770386 |
| 42 | 16178378 |
[0,0,0,0,0,2,2,4,6,10,18,28,46,74,114,184,286,448, 700,1080,1676,2582,3970,6104,9338,14288,21808, 33224,50580,76844,116640,176832,267740,405058, 612110,924204,1394266,2101558,3165406,4764184, 7165530,10770386,16178378] |