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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 5 |
| 9 | 11 |
| 10 | 6 |
| 11 | 0 |
| 12 | 35 |
| 13 | 120 |
| 14 | 136 |
| 15 | 51 |
| 16 | 285 |
| 17 | 1330 |
| 18 | 2310 |
| 19 | 1771 |
| 20 | 3036 |
| 21 | 14950 |
| 22 | 35100 |
| 23 | 40950 |
| 24 | 47502 |
| 25 | 175392 |
| 26 | 503440 |
| 27 | 791120 |
| 28 | 927520 |
| 29 | 2272424 |
| 30 | 7037184 |
| 31 | 13803405 |
| 32 | 18643560 |
| 33 | 33997080 |
| 34 | 98920536 |
| 35 | 226318196 |
| 36 | 359255325 |
| 37 | 578590155 |
| 38 | 1445166360 |
| 39 | 3584815443 |
| 40 | 6573439928 |
[1,0,0,0,1,1,0,0,5,11,6,0,35,120,136,51,285,1330, 2310,1771,3036,14950,35100,40950,47502,175392, 503440,791120,927520,2272424,7037184,13803405, 18643560,33997080,98920536,226318196,359255325, 578590155,1445166360,3584815443,6573439928] |