n | a(n) |
---|---|
20 | 1 |
21 | 21 |
22 | 231 |
23 | 1771 |
24 | 10626 |
25 | 53130 |
26 | 230230 |
27 | 888030 |
28 | 3108105 |
29 | 10015005 |
30 | 30045015 |
31 | 84672315 |
32 | 225792840 |
33 | 573166440 |
34 | 1391975640 |
35 | 3247943160 |
36 | 7307872110 |
37 | 15905368710 |
38 | 33578000610 |
39 | 68923264410 |
40 | 137846528820 |
41 | 269128937220 |
42 | 513791607420 |
43 | 960566918220 |
44 | 1761039350070 |
[1,21,231,1771,10626,53130,230230,888030,3108105, 10015005,30045015,84672315,225792840,573166440, 1391975640,3247943160,7307872110,15905368710, 33578000610,68923264410,137846528820,269128937220, 513791607420,960566918220,1761039350070] |