Numbers of the form k*(k^5 +- 1)/2.

Terms

a(0) =0a(1) =1a(2) =31a(3) =33a(4) =363a(5) =366a(6) =2046a(7) =2050a(8) =7810a(9) =7815a(10) =23325a(11) =23331a(12) =58821a(13) =58828a(14) =131068a(15) =131076a(16) =265716a(17) =265725a(18) =499995a(19) =500005a(20) =885775a(21) =885786a(22) =1492986a(23) =1492998a(24) =2413398a(25) =2413411a(26) =3764761a(27) =3764775a(28) =5695305a(29) =5695320