Sequence is {a(6,n)}, where a(m,n) is defined at sequence A110665.

Terms

a(0) =0a(1) =1a(2) =6a(3) =18a(4) =34a(5) =39a(6) =6a(7) =-97a(8) =-300a(9) =-633a(10) =-1138a(11) =-1881a(12) =-2952a(13) =-4452a(14) =-6480a(15) =-9135a(16) =-12534a(17) =-16830a(18) =-22212a(19) =-28886a(20) =-37056a(21) =-46926a(22) =-58724a(23) =-72726a(24) =-89256a(25) =-108661a(26) =-131286a(27) =-157476a(28) =-187606a(29) =-222111