n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 7 |
3 | 23 |
4 | 153 |
5 | 849 |
6 | 6128 |
7 | 43534 |
8 | 319119 |
9 | 2255466 |
10 | 15307395 |
11 | 98349144 |
12 | 597543497 |
13 | 3430839916 |
14 | 18653684881 |
15 | 96273409815 |
16 | 473010823993 |
17 | 2218614773950 |
18 | 9961651259869 |
19 | 42927432229913 |
20 | 177963663264430 |
[1,1,7,23,153,849,6128,43534,319119,2255466, 15307395,98349144,597543497,3430839916, 18653684881,96273409815,473010823993, 2218614773950,9961651259869,42927432229913, 177963663264430] |