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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 421 |
| 3 | 10384 |
| 4 | 15852 |
| 5 | 115770 |
| 6 | 2158662 |
| 7 | 24386918 |
| 8 | 158640643 |
| 9 | 1293822589 |
| 10 | 14788283853 |
| 11 | 149020593141 |
| 12 | 1275569366713 |
| 13 | 11671994401668 |
| 14 | 115222219445362 |
| 15 | 1107799093548111 |
| 16 | 10250710845474527 |
| 17 | 96126433140397235 |
| 18 | 918622040686576956 |
[0,421,10384,15852,115770,2158662,24386918, 158640643,1293822589,14788283853,149020593141, 1275569366713,11671994401668,115222219445362, 1107799093548111,10250710845474527, 96126433140397235,918622040686576956] |