(-1) times minimal coefficient of the polynomial (1-x)*(1-x^2)*...*(1-x^n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =2a(8) =2a(9) =2a(10) =2a(11) =2a(12) =3a(13) =3a(14) =4a(15) =4a(16) =5a(17) =5a(18) =7a(19) =7a(20) =8a(21) =10a(22) =11a(23) =12a(24) =16a(25) =19a(26) =21a(27) =23a(28) =29a(29) =34