Number of irreducible ways to split 1, 2, 3, ..., 3n into n arithmetic progressions each with 3 terms.
A202705
Number of irreducible ways to split 1, 2, 3, ..., 3n into n arithmetic progressions each with 3 terms.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =25a(6) =115a(7) =649a(8) =4046a(9) =29674a(10) =228030a(11) =1987700a(12) =18402704a(13) =188255116a(14) =2030067605a(15) =23829298479a(16) =293949166112
External references
- oeis: A202705