A142703 - cp's OEIS frontend

A142703 a(n) = 2(n-1)( a(n-1)+a(n-2) ) starting a(1)=a(2)=1.

n	a(n)
1	1
2	1
3	8
4	54
5	496
6	5500
7	71952
8	1084328
9	18500480
10	352526544
11	7420540480
12	171007474528
13	4282272360192
14	115785275702720
15	3361891345761536
16	104330298643927680
17	3446150079670054912
18	120716332862675408128

[1, 1, 8, 54, 496, 5500, 71952, 1084328, 18500480, 352526544, 7420540480, 171007474528, 4282272360192, 115785275702720, 3361891345761536, 104330298643927680, 3446150079670054912, 120716332862675408128]

cp's OEIS Frontend

A142703 a(n) = 2(n-1)( a(n-1)+a(n-2) ) starting a(1)=a(2)=1.

Table of values

List of values

cp's OEIS Frontend

A142703 a(n) = 2*(n-1)*( a(n-1)+a(n-2) ) starting a(1)=a(2)=1.

Table of values

List of values

A142703 a(n) = 2(n-1)( a(n-1)+a(n-2) ) starting a(1)=a(2)=1.