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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 310 |
| 3 | 18020 |
| 4 | 53568 |
| 5 | 154722 |
| 6 | 347316 |
| 7 | 692421 |
| 8 | 1275888 |
| 9 | 2241388 |
| 10 | 3864672 |
| 11 | 6600534 |
| 12 | 11152312 |
| 13 | 18730106 |
| 14 | 31334466 |
| 15 | 52215554 |
| 16 | 86771200 |
| 17 | 143873022 |
| 18 | 237945548 |
| 19 | 392609350 |
| 20 | 646423526 |
| 21 | 1062014984 |
| 22 | 1741176780 |
| 23 | 2849127546 |
| 24 | 4653300102 |
[0,310,18020,53568,154722,347316,692421,1275888, 2241388,3864672,6600534,11152312,18730106, 31334466,52215554,86771200,143873022,237945548, 392609350,646423526,1062014984,1741176780, 2849127546,4653300102] |