Negative of column k=3 sequence of array A103728.

Terms

a(0) =3a(1) =17a(2) =109a(3) =203a(4) =527a(5) =773a(6) =1473a(7) =3163a(8) =3929a(9) =6947a(10) =9639a(11) =11213a(12) =14857a(13) =21683a(14) =30333a(15) =33659a(16) =45077a(17) =53969a(18) =58823a(19) =75113a(20) =87493a(21) =108503a(22) =141407a(23) =160099a(24) =170033a(25) =191117a(26) =202283a(27) =225903a(28) =322937a(29) =355029