Number of ways the set {1,2,...,n} can be split into three subsets of equal sums.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =0a(7) =3a(8) =9a(9) =0a(10) =43a(11) =102a(12) =0a(13) =595a(14) =1480a(15) =0a(16) =9294a(17) =23728a(18) =0a(19) =157991a(20) =411474a(21) =0a(22) =2849968a(23) =7562583a(24) =0a(25) =53987864a(26) =145173095a(27) =0a(28) =1061533318a(29) =2885383960