n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 31 |
3 | 244 |
4 | 1921 |
5 | 15124 |
6 | 119071 |
7 | 937444 |
8 | 7380481 |
9 | 58106404 |
10 | 457470751 |
11 | 3601659604 |
12 | 28355806081 |
13 | 223244789044 |
14 | 1757602506271 |
15 | 13837575261124 |
16 | 108942999582721 |
17 | 857706421400644 |
18 | 6752708371622431 |
19 | 53163960551578804 |
[1,4,31,244,1921,15124,119071,937444,7380481, 58106404,457470751,3601659604,28355806081, 223244789044,1757602506271,13837575261124, 108942999582721,857706421400644,6752708371622431, 53163960551578804] |