n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 19 |
3 | 94 |
4 | 474 |
5 | 2431 |
6 | 12609 |
7 | 65972 |
8 | 347524 |
9 | 1840680 |
10 | 9792986 |
11 | 52296799 |
12 | 280163091 |
13 | 1504969409 |
14 | 8103433329 |
15 | 43722788132 |
16 | 236340999038 |
17 | 1279602656590 |
18 | 6938126362948 |
19 | 37668424608552 |
20 | 204751452911832 |
21 | 1114151447523038 |
[1,4,19,94,474,2431,12609,65972,347524,1840680, 9792986,52296799,280163091,1504969409,8103433329, 43722788132,236340999038,1279602656590, 6938126362948,37668424608552,204751452911832, 1114151447523038] |