Number of set partitions of [3n] into 3-element subsets {i, i+k, i+2k} with 1<=k<=n.
A334250
Number of set partitions of [3n] into 3-element subsets {i, i+k, i+2k} with 1<=k<=n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =35a(6) =129a(7) =567a(8) =2920a(9) =16110a(10) =103467a(11) =717608a(12) =5748214a(13) =47937957a(14) =441139750a(15) =4319093093a(16) =45963368076a(17) =510202534002
External references
- oeis: A334250