Number of set partitions of [n] having at least two blocks with equal element sums.
A275781
Number of set partitions of [n] having at least two blocks with equal element sums.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =3a(5) =9a(6) =43a(7) =209a(8) =1042a(9) =5682a(10) =32875a(11) =200919a(12) =1299092a(13) =8848623a(14) =63108778a(15) =471509591a(16) =3671980053a(17) =29797471739a(18) =251120234182
External references
- oeis: A275781