a(n) = 40*(200*n - 49).

Terms

a(0) =6040a(1) =14040a(2) =22040a(3) =30040a(4) =38040a(5) =46040a(6) =54040a(7) =62040a(8) =70040a(9) =78040a(10) =86040a(11) =94040a(12) =102040a(13) =110040a(14) =118040a(15) =126040a(16) =134040a(17) =142040a(18) =150040a(19) =158040a(20) =166040a(21) =174040a(22) =182040a(23) =190040a(24) =198040a(25) =206040a(26) =214040a(27) =222040a(28) =230040a(29) =238040