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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 310 |
| 3 | 7455 |
| 4 | 195426 |
| 5 | 5416026 |
| 6 | 156061620 |
| 7 | 4628393055 |
| 8 | 140348412490 |
| 9 | 4331544836190 |
| 10 | 135614951248140 |
| 11 | 4296741195214650 |
| 12 | 137507314754659500 |
| 13 | 4438467396322843500 |
| 14 | 144329729055650881560 |
| 15 | 4723733064176346346335 |
[1,15,310,7455,195426,5416026,156061620, 4628393055,140348412490,4331544836190, 135614951248140,4296741195214650, 137507314754659500,4438467396322843500, 144329729055650881560,4723733064176346346335] |