Number of different equations that can be made by summing numbers from 1 to n and using every number not more than once.
A161943
Number of different equations that can be made by summing numbers from 1 to n and using every number not more than once.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =3a(4) =7a(5) =17a(6) =43a(7) =108a(8) =273a(9) =708a(10) =1867a(11) =4955a(12) =13256a(13) =35790a(14) =97340a(15) =266240a(16) =732014a(17) =2022558a(18) =5612579a(19) =15634288a(20) =43702232a(21) =122550885a(22) =344661924a(23) =971908613a(24) =2747404212a(25) =7784038617a(26) =22100387619a(27) =62869809733a(28) =179173559128a(29) =511497066733
External references
- oeis: A161943