Number of odd entries in the character table of the symmetric group S_n.

Terms

a(0) =1a(1) =1a(2) =4a(3) =7a(4) =19a(5) =33a(6) =77a(7) =135a(8) =218a(9) =392a(10) =798a(11) =1312a(12) =2381a(13) =4107a(14) =6639a(15) =11722a(16) =15869a(17) =26333a(18) =45115a(19) =69168a(20) =106213a(21) =170710a(22) =244042a(23) =384991a(24) =592859a(25) =895944a(26) =1326012a(27) =2055454a(28) =2884762a(29) =4466493