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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 94 |
| 3 | 380 |
| 4 | 1176 |
| 5 | 3038 |
| 6 | 6888 |
| 7 | 14148 |
| 8 | 26895 |
| 9 | 48037 |
| 10 | 81510 |
| 11 | 132496 |
| 12 | 207662 |
| 13 | 315420 |
| 14 | 466208 |
| 15 | 672792 |
| 16 | 950589 |
| 17 | 1318011 |
| 18 | 1796830 |
| 19 | 2412564 |
| 20 | 3194884 |
| 21 | 4178042 |
| 22 | 5401320 |
| 23 | 6909500 |
| 24 | 8753355 |
| 25 | 10990161 |
| 26 | 13684230 |
| 27 | 16907464 |
| 28 | 20739930 |
| 29 | 25270456 |
[1,15,94,380,1176,3038,6888,14148,26895,48037, 81510,132496,207662,315420,466208,672792,950589, 1318011,1796830,2412564,3194884,4178042,5401320, 6909500,8753355,10990161,13684230,16907464, 20739930,25270456] |