n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 9 |
5 | 44 |
6 | 385 |
7 | 1854 |
8 | 23233 |
9 | 153656 |
10 | 2151441 |
11 | 18787130 |
12 | 338487721 |
13 | 3165541092 |
14 | 60609811249 |
15 | 835202858294 |
16 | 14913805143105 |
17 | 228441779869424 |
18 | 5319673396479073 |
19 | 81040768940877426 |
20 | 2153026504862728201 |
21 | 39759334398324543260 |
22 | 988919906784578473761 |
[1,0,1,2,9,44,385,1854,23233,153656,2151441, 18787130,338487721,3165541092,60609811249, 835202858294,14913805143105,228441779869424, 5319673396479073,81040768940877426, 2153026504862728201,39759334398324543260, 988919906784578473761] |