n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 9 |
4 | 30 |
5 | 90 |
6 | 308 |
7 | 963 |
8 | 3438 |
9 | 11234 |
10 | 39658 |
11 | 135300 |
12 | 485182 |
13 | 1661050 |
14 | 6059294 |
15 | 21080183 |
16 | 76433836 |
17 | 270898590 |
18 | 989797908 |
19 | 3508506050 |
20 | 12938529420 |
21 | 46251009992 |
22 | 169911558432 |
23 | 613777776976 |
24 | 2265122877620 |
25 | 8178540706698 |
26 | 30359539614762 |
27 | 110190927578014 |
28 | 407970567068040 |
29 | 1490764659238644 |
[1,1,4,9,30,90,308,963,3438,11234,39658,135300, 485182,1661050,6059294,21080183,76433836, 270898590,989797908,3508506050,12938529420, 46251009992,169911558432,613777776976, 2265122877620,8178540706698,30359539614762, 110190927578014,407970567068040,1490764659238644] |