Denominators of the first differences of 1/(n^2 + 1).

Terms

a(0) =2a(1) =10a(2) =10a(3) =170a(4) =442a(5) =962a(6) =1850a(7) =650a(8) =5330a(9) =8282a(10) =12322a(11) =17690a(12) =986a(13) =33490a(14) =44522a(15) =58082a(16) =74530a(17) =18850a(18) =117650a(19) =145162a(20) =177242a(21) =214370a(22) =51410a(23) =305810a(24) =361202a(25) =423802a(26) =494210a(27) =114610a(28) =660970a(29) =758642