Number of nondecreasing arrangements of 4 numbers in -(n+2)..(n+2) with sum zero and not more than two numbers equal.
A188237
Number of nondecreasing arrangements of 4 numbers in -(n+2)..(n+2) with sum zero and not more than two numbers equal.
Terms
- a(0) =15a(1) =30a(2) =52a(3) =81a(4) =121a(5) =172a(6) =234a(7) =311a(8) =403a(9) =510a(10) =636a(11) =781a(12) =945a(13) =1132a(14) =1342a(15) =1575a(16) =1835a(17) =2122a(18) =2436a(19) =2781a(20) =3157a(21) =3564a(22) =4006a(23) =4483a(24) =4995a(25) =5546a(26) =6136a(27) =6765a(28) =7437a(29) =8152
External references
- oeis: A188237