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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 6 |
| 8 | 9 |
| 9 | 13 |
| 10 | 20 |
| 11 | 26 |
| 12 | 36 |
| 13 | 49 |
| 14 | 68 |
| 15 | 90 |
| 16 | 120 |
| 17 | 154 |
| 18 | 201 |
| 19 | 258 |
| 20 | 330 |
| 21 | 418 |
| 22 | 532 |
| 23 | 666 |
| 24 | 834 |
| 25 | 1041 |
| 26 | 1290 |
| 27 | 1592 |
| 28 | 1958 |
| 29 | 2404 |
| 30 | 2935 |
| 31 | 3588 |
| 32 | 4345 |
| 33 | 5278 |
| 34 | 6366 |
| 35 | 7692 |
| 36 | 9215 |
| 37 | 11096 |
| 38 | 13230 |
| 39 | 15853 |
| 40 | 18831 |
| 41 | 22477 |
| 42 | 26580 |
| 43 | 31620 |
| 44 | 37247 |
| 45 | 44145 |
| 46 | 51851 |
| 47 | 61247 |
| 48 | 71681 |
| 49 | 84445 |
[0,0,0,0,1,2,4,6,9,13,20,26,36,49,68,90,120,154, 201,258,330,418,532,666,834,1041,1290,1592,1958, 2404,2935,3588,4345,5278,6366,7692,9215,11096, 13230,15853,18831,22477,26580,31620,37247,44145, 51851,61247,71681,84445] |