n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 12 |
4 | 31 |
5 | 69 |
6 | 181 |
7 | 443 |
8 | 1052 |
9 | 2701 |
10 | 6455 |
11 | 15928 |
12 | 40073 |
13 | 100362 |
14 | 251707 |
15 | 637235 |
16 | 1617175 |
17 | 4124437 |
18 | 10553415 |
19 | 27066974 |
20 | 69709680 |
21 | 179992909 |
22 | 465769803 |
23 | 1208198526 |
24 | 3140421716 |
25 | 8179002096 |
26 | 21338685407 |
27 | 55762149030 |
28 | 145935689361 |
[1,1,12,31,69,181,443,1052,2701,6455,15928,40073, 100362,251707,637235,1617175,4124437,10553415, 27066974,69709680,179992909,465769803,1208198526, 3140421716,8179002096,21338685407,55762149030, 145935689361] |