Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly three ways.
A076456
Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly three ways.
Terms
- a(0) =9a(1) =93a(2) =390a(3) =1110a(4) =2535a(5) =5019a(6) =8988a(7) =14940a(8) =23445a(9) =35145a(10) =50754a(11) =71058a(12) =96915a(13) =129255a(14) =169080a(15) =217464a(16) =275553a(17) =344565a(18) =425790a(19) =520590a(20) =630399a(21) =756723a(22) =901140a(23) =1065300a(24) =1250925a(25) =1459809a(26) =1693818a(27) =1954890a(28) =2245035a(29) =2566335
External references
- oeis: A076456