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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 40 |
| 4 | 132 |
| 5 | 278 |
| 6 | 478 |
| 7 | 732 |
| 8 | 1040 |
| 9 | 1402 |
| 10 | 1818 |
| 11 | 2288 |
| 12 | 2812 |
| 13 | 3390 |
| 14 | 4022 |
| 15 | 4708 |
| 16 | 5448 |
| 17 | 6242 |
| 18 | 7090 |
| 19 | 7992 |
| 20 | 8948 |
| 21 | 9958 |
| 22 | 11022 |
| 23 | 12140 |
| 24 | 13312 |
| 25 | 14538 |
| 26 | 15818 |
| 27 | 17152 |
| 28 | 18540 |
| 29 | 19982 |
| 30 | 21478 |
| 31 | 23028 |
| 32 | 24632 |
| 33 | 26290 |
| 34 | 28002 |
| 35 | 29768 |
| 36 | 31588 |
| 37 | 33462 |
| 38 | 35390 |
| 39 | 37372 |
| 40 | 39408 |
[0,4,40,132,278,478,732,1040,1402,1818,2288,2812, 3390,4022,4708,5448,6242,7090,7992,8948,9958, 11022,12140,13312,14538,15818,17152,18540,19982, 21478,23028,24632,26290,28002,29768,31588,33462, 35390,37372,39408] |