A006139 - cp's OEIS frontend

A006139 na(n) = 2(2n-1)a(n-1) + 4(n-1)a(n-2) with a(0) = 1.

n	a(n)
0	1
1	2
2	8
3	32
4	136
5	592
6	2624
7	11776
8	53344
9	243392
10	1116928
11	5149696
12	23835904
13	110690816
14	515483648
15	2406449152
16	11258054144
17	52767312896
18	247736643584
19	1164829376512
20	5484233814016
21	25852072517632
22	121997903495168

[1, 2, 8, 32, 136, 592, 2624, 11776, 53344, 243392, 1116928, 5149696, 23835904, 110690816, 515483648, 2406449152, 11258054144, 52767312896, 247736643584, 1164829376512, 5484233814016, 25852072517632, 121997903495168]

cp's OEIS Frontend

A006139 na(n) = 2(2n-1)a(n-1) + 4(n-1)a(n-2) with a(0) = 1.

Table of values

List of values

cp's OEIS Frontend

A006139 n*a(n) = 2*(2*n-1)*a(n-1) + 4*(n-1)*a(n-2) with a(0) = 1.

Table of values

List of values

A006139 na(n) = 2(2n-1)a(n-1) + 4(n-1)a(n-2) with a(0) = 1.