Number of ballot results from n voters that prompt a run-off election when three candidates vie for two spots on a board.

A224711

Number of ballot results from n voters that prompt a run-off election when three candidates vie for two spots on a board.

Terms

    a(0) =1a(1) =0a(2) =6a(3) =6a(4) =18a(5) =90a(6) =150a(7) =420a(8) =1890a(9) =3570a(10) =10206a(11) =42966a(12) =87318a(13) =252252a(14) =1019304a(15) =2172456a(16) =6319170a(17) =24810786a(18) =54712086a(19) =159906318a(20) =614406078a(21) =1390381278a(22) =4077926034a(23) =15403838346a(24) =35579546262a(25) =104633453340a(26) =389788932240a(27) =915500037120

External references