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| n | a(n) |
|---|---|
| 1 | 1478 |
| 2 | 1696 |
| 3 | 4908 |
| 4 | 13857 |
| 5 | 43838 |
| 6 | 148202 |
| 7 | 496995 |
| 8 | 1676288 |
| 9 | 5721657 |
| 10 | 19514341 |
| 11 | 66487235 |
| 12 | 226880548 |
| 13 | 774405937 |
| 14 | 2642043704 |
| 15 | 9015737766 |
| 16 | 30767900439 |
| 17 | 104997515770 |
| 18 | 358293959918 |
| 19 | 1222728062406 |
| 20 | 4172538306678 |
| 21 | 14239196910937 |
[1478,1696,4908,13857,43838,148202,496995,1676288, 5721657,19514341,66487235,226880548,774405937, 2642043704,9015737766,30767900439,104997515770, 358293959918,1222728062406,4172538306678, 14239196910937] |