A382125 - cp's OEIS frontend

A382125 G.f. A(x) = exp( Sum_{n>=1} sigma(n)sigma(2n) * x^n/n ), where sigma(n) = A000203(n) is the sum of the divisors of n.

n	a(n)
0	1
1	3
2	15
3	52
4	180
5	555
6	1696
7	4809
8	13410
9	35844
10	93771
11	238305
12	594403
13	1449441
14	3476607
15	8190824
16	19015548
17	43492230
18	98197506
19	218885763
20	482337864
21	1051051262
22	2266904481
23	4840955055
24	10242621395
25	21479302368
26	44666897613
27	92139573135
28	188617118541
29	383280793962
30	773395096907

[1, 3, 15, 52, 180, 555, 1696, 4809, 13410, 35844, 93771, 238305, 594403, 1449441, 3476607, 8190824, 19015548, 43492230, 98197506, 218885763, 482337864, 1051051262, 2266904481, 4840955055, 10242621395, 21479302368, 44666897613, 92139573135, 188617118541, 383280793962, 773395096907]

cp's OEIS Frontend

A382125 G.f. A(x) = exp( Sum_{n>=1} sigma(n)sigma(2n) * x^n/n ), where sigma(n) = A000203(n) is the sum of the divisors of n.

Table of values

List of values

cp's OEIS Frontend

A382125 G.f. A(x) = exp( Sum_{n>=1} sigma(n)*sigma(2*n) * x^n/n ), where sigma(n) = A000203(n) is the sum of the divisors of n.

Table of values

List of values

A382125 G.f. A(x) = exp( Sum_{n>=1} sigma(n)sigma(2n) * x^n/n ), where sigma(n) = A000203(n) is the sum of the divisors of n.