n | a(n) |
---|---|
1 | 4 |
2 | 15 |
3 | 48 |
4 | 175 |
5 | 816 |
6 | 4851 |
7 | 34960 |
8 | 292743 |
9 | 2774040 |
10 | 29251651 |
11 | 339184776 |
12 | 4285584615 |
13 | 58571107168 |
14 | 860622082035 |
15 | 13525670637216 |
16 | 226358825764711 |
17 | 4018390654376520 |
18 | 75413358213752643 |
19 | 1491684815796629080 |
20 | 31014754853346045831 |
21 | 676190458445520562896 |
[4,15,48,175,816,4851,34960,292743,2774040, 29251651,339184776,4285584615,58571107168, 860622082035,13525670637216,226358825764711, 4018390654376520,75413358213752643, 1491684815796629080,31014754853346045831, 676190458445520562896] |