n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 11 |
4 | 28 |
5 | 68 |
6 | 169 |
7 | 470 |
8 | 1276 |
9 | 3395 |
10 | 9016 |
11 | 26240 |
12 | 74017 |
13 | 204590 |
14 | 568120 |
15 | 1659350 |
16 | 4770820 |
17 | 13538480 |
18 | 38435515 |
19 | 113673998 |
20 | 331360936 |
21 | 955040204 |
22 | 2757123412 |
23 | 8185543376 |
24 | 24071728150 |
25 | 70215321944 |
26 | 204746123776 |
27 | 612178795262 |
28 | 1813222985320 |
[2,4,11,28,68,169,470,1276,3395,9016,26240,74017, 204590,568120,1659350,4770820,13538480,38435515, 113673998,331360936,955040204,2757123412, 8185543376,24071728150,70215321944,204746123776, 612178795262,1813222985320] |