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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | 0 |
| 18 | 0 |
| 19 | 1 |
| 20 | 1 |
| 21 | 3 |
| 22 | 7 |
| 23 | 12 |
| 24 | 21 |
| 25 | 38 |
| 26 | 60 |
| 27 | 102 |
| 28 | 165 |
| 29 | 265 |
| 30 | 416 |
| 31 | 660 |
| 32 | 1015 |
| 33 | 1574 |
| 34 | 2405 |
| 35 | 3665 |
| 36 | 5535 |
| 37 | 8364 |
| 38 | 12512 |
| 39 | 18726 |
| 40 | 27862 |
| 41 | 41391 |
| 42 | 61240 |
| 43 | 90541 |
| 44 | 133381 |
| 45 | 196395 |
| 46 | 288534 |
| 47 | 423656 |
| 48 | 621219 |
| 49 | 910885 |
| 50 | 1334634 |
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,3,7,12, 21,38,60,102,165,265,416,660,1015,1574,2405,3665, 5535,8364,12512,18726,27862,41391,61240,90541, 133381,196395,288534,423656,621219,910885,1334634] |