Number of character table entries of the symmetric group S_n which are < 0.

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =13a(5) =34a(6) =72a(7) =137a(8) =249a(9) =524a(10) =953a(11) =1679a(12) =3106a(13) =5270a(14) =9398a(15) =15666a(16) =26284a(17) =43409a(18) =72861a(19) =115940a(20) =189476a(21) =297929a(22) =476904a(23) =743094a(24) =1174624a(25) =1782368a(26) =2787256a(27) =4196505a(28) =6413986a(29) =9645485