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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 7 |
| 2 | 50 |
| 3 | 195 |
| 4 | 560 |
| 5 | 1330 |
| 6 | 2772 |
| 7 | 5250 |
| 8 | 9240 |
| 9 | 15345 |
| 10 | 24310 |
| 11 | 37037 |
| 12 | 54600 |
| 13 | 78260 |
| 14 | 109480 |
| 15 | 149940 |
| 16 | 201552 |
| 17 | 266475 |
| 18 | 347130 |
| 19 | 446215 |
| 20 | 566720 |
| 21 | 711942 |
| 22 | 885500 |
| 23 | 1091350 |
| 24 | 1333800 |
| 25 | 1617525 |
| 26 | 1947582 |
| 27 | 2329425 |
| 28 | 2768920 |
| 29 | 3272360 |
| 30 | 3846480 |
| 31 | 4498472 |
| 32 | 5236000 |
| 33 | 6067215 |
| 34 | 7000770 |
[0,7,50,195,560,1330,2772,5250,9240,15345,24310, 37037,54600,78260,109480,149940,201552,266475, 347130,446215,566720,711942,885500,1091350, 1333800,1617525,1947582,2329425,2768920,3272360, 3846480,4498472,5236000,6067215,7000770] |