a(n) = Sum_{k=1..n} Sum_{j=1..k} Sum_{i=1..j} (k*j*i)^3.
A352979
a(n) = Sum_{k=1..n} Sum_{j=1..k} Sum_{i=1..j} (k*j*i)^3.
Terms
- a(0) =0a(1) =1a(2) =585a(3) =28800a(4) =505280a(5) =4951530a(6) =33209946a(7) =170320080a(8) =714724560a(9) =2566030995a(10) =8130545995a(11) =23253835176a(12) =61054704360a(13) =149085989780a(14) =342048076020a(15) =743408003520
External references
- oeis: A352979