A236791-OEIS公司

A236791型作为一个简单的表

n个	a（n）
1	81
2	255
三	825
4	2817
5	9717
6	34317
7	122305
8	442285
9	1612085
10	5935493
11	21990145
12	82051485
13	307574133
14	1158698629
15	4379531169
16	16610367645
17	63145291189
18	240620562981
19	918393173569
20	3511019670621
21	13437773070709
22	51488379790533

[81,255,825,2817,9717,34317,122305,442285,1612085,5935493,21990145,82051485,307574133,1158698629,4379531169,16610367645,63145291189,240620562981,918393173569,3511019670621,13437773070709,51488379790533]