n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 5 |
3 | 30 |
4 | 80 |
5 | 405 |
6 | 1505 |
7 | 7255 |
8 | 31155 |
9 | 149455 |
10 | 688655 |
11 | 3334880 |
12 | 15965130 |
13 | 78294155 |
14 | 383599455 |
15 | 1903940030 |
16 | 9474093880 |
17 | 47514889255 |
18 | 239112929655 |
19 | 1209724381330 |
20 | 6140755848280 |
21 | 31294613247255 |
22 | 159963286607755 |
23 | 820204107625155 |
24 | 4216569874416955 |
25 | 21732350726100905 |
[1,5,5,30,80,405,1505,7255,31155,149455,688655, 3334880,15965130,78294155,383599455,1903940030, 9474093880,47514889255,239112929655,1209724381330, 6140755848280,31294613247255,159963286607755, 820204107625155,4216569874416955, 21732350726100905] |