A320931 - cp's OEIS frontend

A320931 a(n) = [x^(n*(n+1)/2)] Product_{k=1..n} theta_3(q^k), where theta_3() is the Jacobi theta function.

n	a(n)
0	1
1	2
2	4
3	12
4	24
5	80
6	292
7	966
8	3876
9	15554
10	61608
11	254612
12	1065676
13	4471672
14	19074968
15	82043172
16	354365492
17	1543432514
18	6760146292
19	29732837780
20	131440491584
21	583419967664
22	2598585783488
23	11615321544700
24	52079369904384
25	234157152231726
26	1055628140278948
27	4770576024205060

[1, 2, 4, 12, 24, 80, 292, 966, 3876, 15554, 61608, 254612, 1065676, 4471672, 19074968, 82043172, 354365492, 1543432514, 6760146292, 29732837780, 131440491584, 583419967664, 2598585783488, 11615321544700, 52079369904384, 234157152231726, 1055628140278948, 4770576024205060]

cp's OEIS Frontend

A320931 a(n) = [x^(n*(n+1)/2)] Product_{k=1..n} theta_3(q^k), where theta_3() is the Jacobi theta function.

Table of values

List of values