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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 2 |
| 5 | 3 |
| 6 | 3 |
| 7 | 21 |
| 8 | 30 |
| 9 | 59 |
| 10 | 110 |
| 11 | 242 |
| 12 | 572 |
| 13 | 1153 |
| 14 | 2849 |
| 15 | 6533 |
| 16 | 15911 |
| 17 | 40206 |
| 18 | 101346 |
| 19 | 262483 |
| 20 | 677088 |
| 21 | 1753592 |
| 22 | 4551703 |
| 23 | 11797630 |
| 24 | 30695980 |
| 25 | 79962351 |
| 26 | 208257979 |
| 27 | 544082214 |
| 28 | 1424031328 |
| 29 | 3733666550 |
| 30 | 9813530258 |
| 31 | 25837616418 |
[0,2,3,3,21,30,59,110,242,572,1153,2849,6533, 15911,40206,101346,262483,677088,1753592,4551703, 11797630,30695980,79962351,208257979,544082214, 1424031328,3733666550,9813530258,25837616418] |