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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 12 |
| 5 | 22 |
| 6 | 40 |
| 7 | 69 |
| 8 | 118 |
| 9 | 195 |
| 10 | 317 |
| 11 | 505 |
| 12 | 793 |
| 13 | 1224 |
| 14 | 1867 |
| 15 | 2811 |
| 16 | 4186 |
| 17 | 6168 |
| 18 | 9005 |
| 19 | 13026 |
| 20 | 18692 |
| 21 | 26613 |
| 22 | 37619 |
| 23 | 52815 |
| 24 | 73680 |
| 25 | 102162 |
| 26 | 140853 |
| 27 | 193144 |
| 28 | 263490 |
| 29 | 357699 |
| 30 | 483338 |
| 31 | 650196 |
| 32 | 870953 |
| 33 | 1161916 |
| 34 | 1544048 |
| 35 | 2044188 |
| 36 | 2696627 |
| 37 | 3545015 |
| 38 | 4644850 |
| 39 | 6066425 |
[1,1,3,6,12,22,40,69,118,195,317,505,793,1224, 1867,2811,4186,6168,9005,13026,18692,26613,37619, 52815,73680,102162,140853,193144,263490,357699, 483338,650196,870953,1161916,1544048,2044188, 2696627,3545015,4644850,6066425] |