A193539 - cp's OEIS frontend

A193539 O.g.f.: exp( Sum_{n>=1} (sigma(2n)-sigma(n))^3 x^n/n ).

n	a(n)
0	1
1	8
2	64
3	512
4	3200
5	19392
6	112128
7	598016
8	3088896
9	15362408
10	73331264
11	340653056
12	1538392064
13	6762336448
14	29072665600
15	122299068416
16	504128374784
17	2040557142592
18	8116582974656
19	31760991869952
20	122408808197120
21	464983163273216
22	1742277357389312

[1, 8, 64, 512, 3200, 19392, 112128, 598016, 3088896, 15362408, 73331264, 340653056, 1538392064, 6762336448, 29072665600, 122299068416, 504128374784, 2040557142592, 8116582974656, 31760991869952, 122408808197120, 464983163273216, 1742277357389312]

cp's OEIS Frontend

A193539 O.g.f.: exp( Sum_{n>=1} (sigma(2n)-sigma(n))^3 x^n/n ).

Table of values

List of values

cp's OEIS Frontend

A193539 O.g.f.: exp( Sum_{n>=1} (sigma(2*n)-sigma(n))^3 * x^n/n ).

Table of values

List of values

A193539 O.g.f.: exp( Sum_{n>=1} (sigma(2n)-sigma(n))^3 x^n/n ).