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| n | a(n) |
|---|---|
| 1 | 49 |
| 2 | 98 |
| 3 | 252 |
| 4 | 578 |
| 5 | 1232 |
| 6 | 2738 |
| 7 | 6262 |
| 8 | 14112 |
| 9 | 31500 |
| 10 | 70688 |
| 11 | 159198 |
| 12 | 357858 |
| 13 | 803428 |
| 14 | 1805000 |
| 15 | 4056988 |
| 16 | 9116450 |
| 17 | 20482308 |
| 18 | 46022418 |
| 19 | 103415312 |
| 20 | 232373682 |
| 21 | 522131898 |
| 22 | 1173216800 |
| 23 | 2636206832 |
| 24 | 5923508168 |
| 25 | 13309979250 |
| 26 | 29907242450 |
| 27 | 67201004772 |
[49,98,252,578,1232,2738,6262,14112,31500,70688, 159198,357858,803428,1805000,4056988,9116450, 20482308,46022418,103415312,232373682,522131898, 1173216800,2636206832,5923508168,13309979250, 29907242450,67201004772] |