n | a(n) |
---|---|
1 | 21 |
2 | 237 |
3 | 311 |
4 | 1660 |
5 | 8761 |
6 | 31433 |
7 | 130402 |
8 | 585212 |
9 | 2366785 |
10 | 9815061 |
11 | 42205654 |
12 | 175355823 |
13 | 730455300 |
14 | 3093042582 |
15 | 12946456110 |
16 | 54109637656 |
17 | 227779656571 |
18 | 955289842419 |
19 | 4000305391990 |
20 | 16801782691536 |
21 | 70493554918254 |
[21,237,311,1660,8761,31433,130402,585212,2366785, 9815061,42205654,175355823,730455300,3093042582, 12946456110,54109637656,227779656571,955289842419, 4000305391990,16801782691536,70493554918254] |