A270775-OEIS公司

A270775型作为一个简单的表

n个	a（n）
1	2
2	12
三	80
4	252
5	1100
6	1872
7	4352
8	6156
9	11132
10	22736
11	27900
12	47952
13	65600
14	75852
15	99452
16	143312
17	198476
18	219600
19	291852
20	347900
21	378432
22	480636
23	558092
24	689216
25	893952
26	1010000
27	1071612
28	1202252
29	1271376
30	1417472
31	2016252
32	2213900
33	2533952
34	2647116
35	3263696

[2,12,80,252,1100,1872,4352,6156,11132,22736,27900,47952,65600,75852,99452,143312,198476,219600,291852,347900,378432,480636,558092,689216,893952,1010000,1071612,1202252,1271376,1417472,2016252,2213900,2533952,2647116,3263696]