A274224-组织环境信息系统

A274224型作为一个简单的表

n个	a（n）
0	1
1	三
2	4
三	12
4	16
5	48
6	68
7	204
8	256
9	768
10	1088
11	3264
12	4112
13	12336
14	17476
15	52428
16	65536
17	196608
18	278528
19	835584
20	1052672
21	3158016
22	4473856
23	13421568
24	16777472
25	50332416
26	71304256
27	213912768
28	269488144
29	808464432
30	1145324612
31	3435973836
32	4294967296
33	12884901888

[1,3,4,12,16,48,68,204,256,768,1088,3264,4112,12336,17476,52428,65536,196608,278528,835584,1052672,3158016,4473856,13421568,16777472,50332416,71304256,213912768,269488144,808464432,1145324612,3435973836,4294967296,12884901888]