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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 51 |
| 4 | 155 |
| 5 | 381 |
| 6 | 780 |
| 7 | 1451 |
| 8 | 2460 |
| 9 | 3951 |
| 10 | 6000 |
| 11 | 8801 |
| 12 | 12435 |
| 13 | 17151 |
| 14 | 23030 |
| 15 | 30381 |
| 16 | 39280 |
| 17 | 50101 |
| 18 | 62910 |
| 19 | 78151 |
| 20 | 95875 |
| 21 | 116601 |
| 22 | 140360 |
| 23 | 167751 |
| 24 | 198780 |
| 25 | 234131 |
| 26 | 273780 |
| 27 | 318501 |
| 28 | 368235 |
| 29 | 423851 |
| 30 | 485250 |
| 31 | 553401 |
| 32 | 628160 |
| 33 | 710601 |
| 34 | 800530 |
[0,1,10,51,155,381,780,1451,2460,3951,6000,8801, 12435,17151,23030,30381,39280,50101,62910,78151, 95875,116601,140360,167751,198780,234131,273780, 318501,368235,423851,485250,553401,628160,710601, 800530] |