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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 13 |
| 4 | 45 |
| 5 | 115 |
| 6 | 245 |
| 7 | 462 |
| 8 | 798 |
| 9 | 1290 |
| 10 | 1980 |
| 11 | 2915 |
| 12 | 4147 |
| 13 | 5733 |
| 14 | 7735 |
| 15 | 10220 |
| 16 | 13260 |
| 17 | 16932 |
| 18 | 21318 |
| 19 | 26505 |
| 20 | 32585 |
| 21 | 39655 |
| 22 | 47817 |
| 23 | 57178 |
| 24 | 67850 |
| 25 | 79950 |
| 26 | 93600 |
| 27 | 108927 |
| 28 | 126063 |
| 29 | 145145 |
| 30 | 166315 |
| 31 | 189720 |
| 32 | 215512 |
| 33 | 243848 |
| 34 | 274890 |
| 35 | 308805 |
[0,0,2,13,45,115,245,462,798,1290,1980,2915,4147, 5733,7735,10220,13260,16932,21318,26505,32585, 39655,47817,57178,67850,79950,93600,108927,126063, 145145,166315,189720,215512,243848,274890,308805] |