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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 19 |
| 3 | 55 |
| 4 | 140 |
| 5 | 316 |
| 6 | 660 |
| 7 | 1284 |
| 8 | 2370 |
| 9 | 4170 |
| 10 | 7062 |
| 11 | 11550 |
| 12 | 18348 |
| 13 | 28380 |
| 14 | 42900 |
| 15 | 63492 |
| 16 | 92235 |
| 17 | 131703 |
| 18 | 185185 |
| 19 | 256685 |
| 20 | 351208 |
| 21 | 474760 |
| 22 | 634712 |
| 23 | 839800 |
| 24 | 1100580 |
| 25 | 1429428 |
| 26 | 1841100 |
| 27 | 2352732 |
| 28 | 2984520 |
| 29 | 3759720 |
| 30 | 4705464 |
| 31 | 5852760 |
| 32 | 7237461 |
| 33 | 8900265 |
| 34 | 10887855 |
[1,5,19,55,140,316,660,1284,2370,4170,7062,11550, 18348,28380,42900,63492,92235,131703,185185, 256685,351208,474760,634712,839800,1100580, 1429428,1841100,2352732,2984520,3759720,4705464, 5852760,7237461,8900265,10887855] |