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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 44 |
| 5 | 493 |
| 6 | 9974 |
| 7 | 372403 |
| 8 | 26247008 |
| 9 | 3559692121 |
| 10 | 942403603562 |
| 11 | 491777568765151 |
| 12 | 508938530329020692 |
| 13 | 1048381120745440503877 |
| 14 | 4307758467916752367544414 |
| 15 | 35349370769806113877653011083 |
| 16 | 579693879415731511179957972407624 |
[1,1,2,7,44,493,9974,372403,26247008,3559692121, 942403603562,491777568765151,508938530329020692, 1048381120745440503877,4307758467916752367544414, 35349370769806113877653011083, 579693879415731511179957972407624] |