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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 11 |
| 3 | 28 |
| 4 | 64 |
| 5 | 136 |
| 6 | 274 |
| 7 | 528 |
| 8 | 982 |
| 9 | 1772 |
| 10 | 3115 |
| 11 | 5352 |
| 12 | 9012 |
| 13 | 14904 |
| 14 | 24252 |
| 15 | 38888 |
| 16 | 61527 |
| 17 | 96156 |
| 18 | 148584 |
| 19 | 227204 |
| 20 | 344056 |
| 21 | 516296 |
| 22 | 768206 |
| 23 | 1133952 |
| 24 | 1661326 |
| 25 | 2416816 |
| 26 | 3492442 |
| 27 | 5014932 |
| 28 | 7157996 |
| 29 | 10158672 |
| 30 | 14339032 |
| 31 | 20134888 |
| 32 | 28133641 |
| 33 | 39124028 |
| 34 | 54161282 |
| 35 | 74652260 |
[1,4,11,28,64,136,274,528,982,1772,3115,5352,9012, 14904,24252,38888,61527,96156,148584,227204, 344056,516296,768206,1133952,1661326,2416816, 3492442,5014932,7157996,10158672,14339032, 20134888,28133641,39124028,54161282,74652260] |