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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 16 |
| 2 | 48 |
| 3 | 101 |
| 4 | 421 |
| 5 | 2374 |
| 6 | 7728 |
| 7 | 9449 |
| 8 | 17685 |
| 9 | 83666 |
| 10 | 71168 |
| 11 | 128130 |
| 12 | 555251 |
| 13 | 412816 |
| 14 | 271385 |
| 15 | 1111695 |
| 16 | 1910101 |
| 17 | 11633401 |
| 18 | 14851698 |
| 19 | 9668058 |
| 20 | 43227391 |
| 21 | 159078942 |
[0,16,48,101,421,2374,7728,9449,17685,83666,71168, 128130,555251,412816,271385,1111695,1910101, 11633401,14851698,9668058,43227391,159078942] |