n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 46 |
6 | 146 |
7 | 460 |
8 | 1436 |
9 | 4352 |
10 | 13252 |
11 | 40532 |
12 | 124396 |
13 | 381140 |
14 | 1166708 |
15 | 3570684 |
16 | 10932274 |
17 | 33475170 |
18 | 102499334 |
19 | 313825690 |
20 | 960844358 |
21 | 2941873064 |
22 | 9007393480 |
23 | 27578681888 |
24 | 84439657768 |
25 | 258534813320 |
26 | 791574775192 |
27 | 2423623112104 |
28 | 7420586212184 |
29 | 22720153701768 |
30 | 69563959091138 |
[0,0,2,6,18,46,146,460,1436,4352,13252,40532, 124396,381140,1166708,3570684,10932274,33475170, 102499334,313825690,960844358,2941873064, 9007393480,27578681888,84439657768,258534813320, 791574775192,2423623112104,7420586212184, 22720153701768,69563959091138] |