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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 44 |
| 2 | 428 |
| 3 | 10196 |
| 4 | 10719068 |
| 5 | 25865068 |
| 6 | 5472607916 |
| 7 | 74185965772 |
| 8 | 264698472181028 |
| 9 | 2290048394728148 |
| 10 | 19435959308462817284 |
| 11 | 2753151578548809148 |
| 12 | 20586893910854623222436 |
| 13 | 134344844535611780572028924 |
[4,44,428,10196,10719068,25865068,5472607916, 74185965772,264698472181028,2290048394728148, 19435959308462817284,2753151578548809148, 20586893910854623222436, 134344844535611780572028924] |