n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 13 |
4 | 37 |
5 | 101 |
6 | 269 |
7 | 710 |
8 | 1865 |
9 | 4890 |
10 | 12810 |
11 | 33546 |
12 | 87834 |
13 | 229963 |
14 | 602062 |
15 | 1576231 |
16 | 4126639 |
17 | 10803695 |
18 | 28284455 |
19 | 74049680 |
20 | 193864595 |
21 | 507544116 |
22 | 1328767764 |
23 | 3478759188 |
24 | 9107509812 |
25 | 23843770261 |
26 | 62423800984 |
27 | 163427632705 |
[0,1,4,13,37,101,269,710,1865,4890,12810,33546, 87834,229963,602062,1576231,4126639,10803695, 28284455,74049680,193864595,507544116,1328767764, 3478759188,9107509812,23843770261,62423800984, 163427632705] |