a(n) = 5*(-1)^n*A078008(n).

Terms

a(0) =5a(1) =0a(2) =10a(3) =-10a(4) =30a(5) =-50a(6) =110a(7) =-210a(8) =430a(9) =-850a(10) =1710a(11) =-3410a(12) =6830a(13) =-13650a(14) =27310a(15) =-54610a(16) =109230a(17) =-218450a(18) =436910a(19) =-873810a(20) =1747630a(21) =-3495250a(22) =6990510a(23) =-13981010a(24) =27962030a(25) =-55924050a(26) =111848110a(27) =-223696210a(28) =447392430a(29) =-894784850