n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 9 |
3 | 42 |
4 | 152 |
5 | 480 |
6 | 1392 |
7 | 3808 |
8 | 9984 |
9 | 25344 |
10 | 62720 |
11 | 152064 |
12 | 362496 |
13 | 851968 |
14 | 1978368 |
15 | 4546560 |
16 | 10354688 |
17 | 23396352 |
18 | 52494336 |
19 | 117047296 |
20 | 259522560 |
21 | 572522496 |
22 | 1257242624 |
23 | 2749366272 |
24 | 5989466112 |
25 | 13002342400 |
26 | 28135391232 |
[0,1,9,42,152,480,1392,3808,9984,25344,62720, 152064,362496,851968,1978368,4546560,10354688, 23396352,52494336,117047296,259522560,572522496, 1257242624,2749366272,5989466112,13002342400, 28135391232] |