n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 5 |
4 | 18 |
5 | 56 |
6 | 191 |
7 | 640 |
8 | 2133 |
9 | 7141 |
10 | 23881 |
11 | 79850 |
12 | 267048 |
13 | 893051 |
14 | 2986496 |
15 | 9987385 |
16 | 33399513 |
17 | 111693661 |
18 | 373522786 |
19 | 1249124120 |
20 | 4177284903 |
21 | 13969556096 |
22 | 46716587501 |
23 | 156228267805 |
24 | 522454078593 |
25 | 1747175898106 |
26 | 5842855371016 |
27 | 19539508829315 |
28 | 65343463262208 |
[0,1,1,5,18,56,191,640,2133,7141,23881,79850, 267048,893051,2986496,9987385,33399513,111693661, 373522786,1249124120,4177284903,13969556096, 46716587501,156228267805,522454078593, 1747175898106,5842855371016,19539508829315, 65343463262208] |