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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 15 |
| 4 | 44 |
| 5 | 105 |
| 6 | 216 |
| 7 | 399 |
| 8 | 680 |
| 9 | 1089 |
| 10 | 1660 |
| 11 | 2431 |
| 12 | 3444 |
| 13 | 4745 |
| 14 | 6384 |
| 15 | 8415 |
| 16 | 10896 |
| 17 | 13889 |
| 18 | 17460 |
| 19 | 21679 |
| 20 | 26620 |
| 21 | 32361 |
| 22 | 38984 |
| 23 | 46575 |
| 24 | 55224 |
| 25 | 65025 |
| 26 | 76076 |
| 27 | 88479 |
| 28 | 102340 |
| 29 | 117769 |
| 30 | 134880 |
| 31 | 153791 |
| 32 | 174624 |
| 33 | 197505 |
| 34 | 222564 |
| 35 | 249935 |
| 36 | 279756 |
| 37 | 312169 |
| 38 | 347320 |
| 39 | 385359 |
| 40 | 426440 |
[0,1,4,15,44,105,216,399,680,1089,1660,2431,3444, 4745,6384,8415,10896,13889,17460,21679,26620, 32361,38984,46575,55224,65025,76076,88479,102340, 117769,134880,153791,174624,197505,222564,249935, 279756,312169,347320,385359,426440] |