A218782-OEIS公司

A218782号作为一个简单的表

n个	a（n）
1	2
2	12
三	52
4	216
5	872
6	3496
7	14024
8	56200
9	224904
10	899720
11	3599496
12	14398600
13	57599112
14	230398088
15	921606280
16	3686471816
17	14745933960
18	58983782536
19	235935438984
20	943742064776
21	3774970665096
22	15099883493512
23	60399541098632
24	241598171519112
25	966392760309896

[2,12,52,216,872,3496,14024,56200,224904,899720,3599496,14398600,57599112,230398088,921606280,3686471816,14745933960,58983782536,235935438984,943742064776,3774970665096,15099883493512,60399541098632,241598171519112,966392760309896]