n | a(n) |
---|---|
1 | 1 |
2 | 7 |
3 | 20 |
4 | 57 |
5 | 160 |
6 | 454 |
7 | 1292 |
8 | 3676 |
9 | 10452 |
10 | 29724 |
11 | 84548 |
12 | 240480 |
13 | 683968 |
14 | 1945348 |
15 | 5533040 |
16 | 15737260 |
17 | 44760324 |
18 | 127308564 |
19 | 362094824 |
20 | 1029880752 |
21 | 2929216636 |
22 | 8331363064 |
23 | 23696305892 |
24 | 67397723860 |
25 | 191694568548 |
26 | 545223274608 |
[1,7,20,57,160,454,1292,3676,10452,29724,84548, 240480,683968,1945348,5533040,15737260,44760324, 127308564,362094824,1029880752,2929216636, 8331363064,23696305892,67397723860,191694568548, 545223274608] |