n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 2 |
4 | 4 |
5 | 34 |
6 | 62 |
7 | 480 |
8 | 870 |
9 | 6692 |
10 | 12124 |
11 | 93214 |
12 | 168872 |
13 | 1298310 |
14 | 2352090 |
15 | 18083132 |
16 | 32760394 |
17 | 251865544 |
18 | 456293432 |
19 | 3508034490 |
20 | 6355347660 |
21 | 48860617322 |
22 | 88518573814 |
23 | 680540608024 |
24 | 1232904685742 |
25 | 9478707895020 |
26 | 17172147026580 |
27 | 132021369922262 |
28 | 239177153686384 |
[0,0,2,4,34,62,480,870,6692,12124,93214,168872, 1298310,2352090,18083132,32760394,251865544, 456293432,3508034490,6355347660,48860617322, 88518573814,680540608024,1232904685742, 9478707895020,17172147026580,132021369922262, 239177153686384] |