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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 31 |
| 3 | 242 |
| 4 | 992 |
| 5 | 3124 |
| 6 | 7502 |
| 7 | 16806 |
| 8 | 31744 |
| 9 | 58806 |
| 10 | 96844 |
| 11 | 161050 |
| 12 | 240064 |
| 13 | 371292 |
| 14 | 520986 |
| 15 | 756008 |
| 16 | 1015808 |
| 17 | 1419856 |
| 18 | 1822986 |
| 19 | 2476098 |
| 20 | 3099008 |
| 21 | 4067052 |
| 22 | 4992550 |
| 23 | 6436342 |
| 24 | 7682048 |
| 25 | 9762500 |
| 26 | 11510052 |
| 27 | 14289858 |
| 28 | 16671552 |
| 29 | 20511148 |
[1,31,242,992,3124,7502,16806,31744,58806,96844, 161050,240064,371292,520986,756008,1015808, 1419856,1822986,2476098,3099008,4067052,4992550, 6436342,7682048,9762500,11510052,14289858, 16671552,20511148] |