A321183 - cp's OEIS frontend

A321183 a(n) = [x^((n(n+1)/2)^2)] Product_{k=1..n} Sum_{m>=0} x^(k^2m).

n	a(n)
0	1
1	1
2	3
3	26
4	438
5	11674
6	434613
7	21040885
8	1263748763
9	91057116368
10	7676892453542
11	742890018054927
12	81267790173334794
13	9926903213704358577
14	1340280764681712515084
15	198320073897808037293388
16	31929177807445245255119558
17	5558580993355817894674501169
18	1040777481846356463369367882750

[1, 1, 3, 26, 438, 11674, 434613, 21040885, 1263748763, 91057116368, 7676892453542, 742890018054927, 81267790173334794, 9926903213704358577, 1340280764681712515084, 198320073897808037293388, 31929177807445245255119558, 5558580993355817894674501169, 1040777481846356463369367882750]

cp's OEIS Frontend

A321183 a(n) = [x^((n(n+1)/2)^2)] Product_{k=1..n} Sum_{m>=0} x^(k^2m).

Table of values

List of values

cp's OEIS Frontend

A321183 a(n) = [x^((n*(n+1)/2)^2)] Product_{k=1..n} Sum_{m>=0} x^(k^2*m).

Table of values

List of values

A321183 a(n) = [x^((n(n+1)/2)^2)] Product_{k=1..n} Sum_{m>=0} x^(k^2m).