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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 18 |
| 4 | 44 |
| 5 | 90 |
| 6 | 174 |
| 7 | 294 |
| 8 | 472 |
| 9 | 702 |
| 10 | 1010 |
| 11 | 1430 |
| 12 | 1932 |
| 13 | 2574 |
| 14 | 3346 |
| 15 | 4230 |
| 16 | 5264 |
| 17 | 6494 |
| 18 | 7938 |
| 19 | 9538 |
| 20 | 11380 |
| 21 | 13440 |
| 22 | 15686 |
| 23 | 18216 |
| 24 | 21000 |
| 25 | 24100 |
| 26 | 27586 |
| 27 | 31374 |
| 28 | 35420 |
| 29 | 39788 |
| 30 | 44430 |
| 31 | 49414 |
| 32 | 55072 |
| 33 | 61116 |
| 34 | 67626 |
| 35 | 74480 |
| 36 | 81972 |
| 37 | 89836 |
| 38 | 98230 |
| 39 | 107172 |
| 40 | 116600 |
| 41 | 126608 |
[0,1,6,18,44,90,174,294,472,702,1010,1430,1932, 2574,3346,4230,5264,6494,7938,9538,11380,13440, 15686,18216,21000,24100,27586,31374,35420,39788, 44430,49414,55072,61116,67626,74480,81972,89836, 98230,107172,116600,126608] |