First differences of coefficients of g.f. (1-x)^24.

Terms

a(0) =-25a(1) =300a(2) =-2300a(3) =12650a(4) =-53130a(5) =177100a(6) =-480700a(7) =1081575a(8) =-2042975a(9) =3268760a(10) =-4457400a(11) =5200300a(12) =-5200300a(13) =4457400a(14) =-3268760a(15) =2042975a(16) =-1081575a(17) =480700a(18) =-177100a(19) =53130a(20) =-12650a(21) =2300a(22) =-300a(23) =25