n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 9 |
3 | 37 |
4 | 233 |
5 | 1251 |
6 | 7461 |
7 | 43219 |
8 | 257769 |
9 | 1534096 |
10 | 9224259 |
11 | 55607850 |
12 | 336885029 |
13 | 2046705428 |
14 | 12472585155 |
15 | 76185639162 |
16 | 466380345065 |
17 | 2860318763352 |
18 | 17571932737128 |
19 | 108111252582449 |
20 | 666049600308483 |
21 | 4108363051479346 |
22 | 25369393216077370 |
[1,1,9,37,233,1251,7461,43219,257769,1534096, 9224259,55607850,336885029,2046705428,12472585155, 76185639162,466380345065,2860318763352, 17571932737128,108111252582449,666049600308483, 4108363051479346,25369393216077370] |