a(n) is the sum of all products of pairs of numbers joined by the diagonals of an n-gon when its vertices are numbered from 1 to n in order.
A337130
a(n) is the sum of all products of pairs of numbers joined by the diagonals of an n-gon when its vertices are numbered from 1 to n in order.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =11a(4) =40a(5) =99a(6) =203a(7) =370a(8) =621a(9) =980a(10) =1474a(11) =2133a(12) =2990a(13) =4081a(14) =5445a(15) =7124a(16) =9163a(17) =11610a(18) =14516a(19) =17935a(20) =21924a(21) =26543a(22) =31855a(23) =37926a(24) =44825a(25) =52624a(26) =61398a(27) =71225a(28) =82186a(29) =94365
External references
- oeis: A337130