n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 11 |
5 | 40 |
6 | 148 |
7 | 553 |
8 | 2083 |
9 | 7896 |
10 | 30086 |
11 | 115126 |
12 | 442118 |
13 | 1703052 |
14 | 6577474 |
15 | 25461493 |
16 | 98759971 |
17 | 383751472 |
18 | 1493506534 |
19 | 5820778858 |
20 | 22714926826 |
21 | 88745372992 |
22 | 347087585824 |
23 | 1358789148058 |
24 | 5324148664846 |
25 | 20878676356240 |
26 | 81937643449468 |
27 | 321786401450268 |
[0,1,3,11,40,148,553,2083,7896,30086,115126, 442118,1703052,6577474,25461493,98759971, 383751472,1493506534,5820778858,22714926826, 88745372992,347087585824,1358789148058, 5324148664846,20878676356240,81937643449468, 321786401450268] |