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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 26 |
| 4 | 226 |
| 5 | 372 |
| 6 | 1457 |
| 7 | 3312 |
| 8 | 9159 |
| 9 | 13320 |
| 10 | 32077 |
| 11 | 50752 |
| 12 | 102027 |
| 13 | 138554 |
| 14 | 249053 |
| 15 | 331920 |
| 16 | 535444 |
| 17 | 655423 |
| 18 | 966278 |
| 19 | 1152057 |
| 20 | 1546854 |
| 21 | 1751100 |
| 22 | 2168566 |
| 23 | 2374001 |
| 24 | 2719026 |
| 25 | 2850784 |
| 26 | 3029814 |
| 27 | 3063907 |
| 28 | 3019100 |
| 29 | 2943918 |
| 30 | 2691740 |
| 31 | 2519884 |
| 32 | 2134422 |
| 33 | 1930862 |
| 34 | 1511648 |
| 35 | 1303187 |
| 36 | 935353 |
| 37 | 783315 |
| 38 | 514221 |
| 39 | 402227 |
| 40 | 238252 |
| 41 | 182466 |
| 42 | 97415 |
| 43 | 66012 |
| 44 | 30140 |
| 45 | 21162 |
| 46 | 8438 |
| 47 | 4350 |
| 48 | 1311 |
| 49 | 906 |
| 50 | 170 |
| 51 | 65 |
| 52 | 3 |
| 53 | 1 |
[0,2,26,226,372,1457,3312,9159,13320,32077,50752, 102027,138554,249053,331920,535444,655423,966278, 1152057,1546854,1751100,2168566,2374001,2719026, 2850784,3029814,3063907,3019100,2943918,2691740, 2519884,2134422,1930862,1511648,1303187,935353, 783315,514221,402227,238252,182466,97415,66012, 30140,21162,8438,4350,1311,906,170,65,3,1] |