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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 15 |
| 3 | 72 |
| 4 | 221 |
| 5 | 536 |
| 6 | 1098 |
| 7 | 2028 |
| 8 | 3445 |
| 9 | 5502 |
| 10 | 8368 |
| 11 | 12234 |
| 12 | 17304 |
| 13 | 23794 |
| 14 | 31963 |
| 15 | 42089 |
| 16 | 54439 |
| 17 | 69332 |
| 18 | 87070 |
| 19 | 108013 |
| 20 | 132549 |
| 21 | 161043 |
| 22 | 193924 |
| 23 | 231550 |
| 24 | 274463 |
| 25 | 323023 |
| 26 | 377776 |
| 27 | 439254 |
| 28 | 507882 |
| 29 | 584329 |
| 30 | 669046 |
| 31 | 762686 |
| 32 | 865804 |
| 33 | 979052 |
[0,1,15,72,221,536,1098,2028,3445,5502,8368,12234, 17304,23794,31963,42089,54439,69332,87070,108013, 132549,161043,193924,231550,274463,323023,377776, 439254,507882,584329,669046,762686,865804,979052] |