n | a(n) |
---|---|
1 | 1 |
2 | 9 |
3 | 72 |
4 | 320 |
5 | 1185 |
6 | 3892 |
7 | 11776 |
8 | 33480 |
9 | 90745 |
10 | 236808 |
11 | 599112 |
12 | 1477216 |
13 | 3564001 |
14 | 8439960 |
15 | 19666688 |
16 | 45183824 |
17 | 102520881 |
18 | 230046452 |
19 | 511085960 |
20 | 1125313056 |
21 | 2457641857 |
22 | 5327760940 |
23 | 11471647872 |
24 | 24547187800 |
25 | 52225646057 |
26 | 110524638672 |
[1,9,72,320,1185,3892,11776,33480,90745,236808, 599112,1477216,3564001,8439960,19666688,45183824, 102520881,230046452,511085960,1125313056, 2457641857,5327760940,11471647872,24547187800, 52225646057,110524638672] |