a(n) = [x^((n*(n+1)/2)^2)] Product_{k=1..n} Sum_{m>=0} x^(k*m^2).
A321181
a(n) = [x^((n*(n+1)/2)^2)] Product_{k=1..n} Sum_{m>=0} x^(k*m^2).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =28a(5) =262a(6) =3428a(7) =52289a(8) =1147221a(9) =30161625a(10) =893291633a(11) =30894822277
External references
- oeis: A321181