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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 50 |
| 3 | 242 |
| 4 | 972 |
| 5 | 2857 |
| 6 | 7951 |
| 7 | 19046 |
| 8 | 43667 |
| 9 | 91607 |
| 10 | 184623 |
| 11 | 351192 |
| 12 | 646548 |
| 13 | 1141473 |
| 14 | 1960891 |
| 15 | 3264879 |
| 16 | 5311415 |
| 17 | 8429947 |
| 18 | 13122714 |
| 19 | 20020724 |
| 20 | 30044769 |
| 21 | 44339233 |
| 22 | 64511381 |
| 23 | 92542864 |
| 24 | 131127774 |
| 25 | 183555267 |
| 26 | 254185657 |
| 27 | 348298202 |
| 28 | 472732818 |
[2,50,242,972,2857,7951,19046,43667,91607,184623, 351192,646548,1141473,1960891,3264879,5311415, 8429947,13122714,20020724,30044769,44339233, 64511381,92542864,131127774,183555267,254185657, 348298202,472732818] |