a(n) is the smallest hexagonal number for which the symmetric representation of sigma(n) has width 2*n, n >= 0, at the diagonal.

A350712

a(n) is the smallest hexagonal number for which the symmetric representation of sigma(n) has width 2*n, n >= 0, at the diagonal.

Terms

    a(0) =0a(1) =6a(2) =120a(3) =2016a(4) =7140a(5) =61776a(6) =103740a(7) =738720a(8) =437580a(9) =1185030a(10) =4680270a(11) =4426800a(12) =2031120a(13) =6193440a(14) =4915680a(15) =30728880a(16) =2162160a(17) =48565440a(18) =134734320a(19) =286071240a(20) =163723560a(21) =376902240a(22) =536592420a(23) =137373600a(24) =76576500a(25) =391986000a(26) =214980480a(27) =103672800a(28) =1018606680a(29) =5401294080

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