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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 5 |
| 2 | 130 |
| 3 | 975 |
| 4 | 4100 |
| 5 | 12505 |
| 6 | 31110 |
| 7 | 67235 |
| 8 | 131080 |
| 9 | 236205 |
| 10 | 400010 |
| 11 | 644215 |
| 12 | 995340 |
| 13 | 1485185 |
| 14 | 2151310 |
| 15 | 3037515 |
| 16 | 4194320 |
| 17 | 5679445 |
| 18 | 7558290 |
| 19 | 9904415 |
| 20 | 12800020 |
| 21 | 16336425 |
| 22 | 20614550 |
| 23 | 25745395 |
| 24 | 31850520 |
| 25 | 39062525 |
| 26 | 47525530 |
| 27 | 57395655 |
| 28 | 68841500 |
| 29 | 82044625 |
| 30 | 97200030 |
| 31 | 114516635 |
[0,5,130,975,4100,12505,31110,67235,131080,236205, 400010,644215,995340,1485185,2151310,3037515, 4194320,5679445,7558290,9904415,12800020,16336425, 20614550,25745395,31850520,39062525,47525530, 57395655,68841500,82044625,97200030,114516635] |