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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 9 |
| 7 | 21 |
| 8 | 52 |
| 9 | 113 |
| 10 | 261 |
| 11 | 550 |
| 12 | 1226 |
| 13 | 2542 |
| 14 | 5546 |
| 15 | 11389 |
| 16 | 24494 |
| 17 | 49989 |
| 18 | 106413 |
| 19 | 216258 |
| 20 | 456826 |
| 21 | 925586 |
| 22 | 1943550 |
| 23 | 3929090 |
| 24 | 8210896 |
| 25 | 16571018 |
| 26 | 34494114 |
| 27 | 69523116 |
| 28 | 144246532 |
| 29 | 290424604 |
| 30 | 600907508 |
| 31 | 1208835421 |
| 32 | 2495229602 |
| 33 | 5016122029 |
| 34 | 10332784253 |
| 35 | 20759855626 |
[0,0,0,0,1,3,9,21,52,113,261,550,1226,2542,5546, 11389,24494,49989,106413,216258,456826,925586, 1943550,3929090,8210896,16571018,34494114, 69523116,144246532,290424604,600907508,1208835421, 2495229602,5016122029,10332784253,20759855626] |