A321139 - cp's OEIS frontend

A321139 a(n) = [x^(n^2)] Product_{k=1..n} Sum_{m>=0} x^(k*m^2).

n	a(n)
0	1
1	1
2	1
3	3
4	7
5	17
6	52
7	144
8	480
9	1732
10	5902
11	21078
12	78434
13	289107
14	1079949
15	4094643
16	15574377
17	59667023
18	230318968
19	892694240
20	3477119540
21	13606993083
22	53438614380
23	210622413188
24	832922044686
25	3303392730698
26	13137474884294
27	52381331536536
28	209340904575968

[1, 1, 1, 3, 7, 17, 52, 144, 480, 1732, 5902, 21078, 78434, 289107, 1079949, 4094643, 15574377, 59667023, 230318968, 892694240, 3477119540, 13606993083, 53438614380, 210622413188, 832922044686, 3303392730698, 13137474884294, 52381331536536, 209340904575968]

cp's OEIS Frontend

A321139 a(n) = [x^(n^2)] Product_{k=1..n} Sum_{m>=0} x^(k*m^2).

Table of values

List of values