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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 5 |
| 2 | 70 |
| 3 | 450 |
| 4 | 1680 |
| 5 | 4800 |
| 6 | 11310 |
| 7 | 23590 |
| 8 | 44600 |
| 9 | 78615 |
| 10 | 130550 |
| 11 | 207075 |
| 12 | 315600 |
| 13 | 465790 |
| 14 | 667940 |
| 15 | 935250 |
| 16 | 1281520 |
| 17 | 1723970 |
| 18 | 2280330 |
| 19 | 2972455 |
| 20 | 3822500 |
| 21 | 4857510 |
| 22 | 6104560 |
| 23 | 7596325 |
| 24 | 9365400 |
| 25 | 11450750 |
| 26 | 13890760 |
| 27 | 16731225 |
| 28 | 20017060 |
| 29 | 23801315 |
| 30 | 28135800 |
| 31 | 33081495 |
[0,5,70,450,1680,4800,11310,23590,44600,78615, 130550,207075,315600,465790,667940,935250,1281520, 1723970,2280330,2972455,3822500,4857510,6104560, 7596325,9365400,11450750,13890760,16731225, 20017060,23801315,28135800,33081495] |