Poly-Cauchy numbers of the second kind -hat c_3^(-n).

Terms

a(0) =17a(1) =51a(2) =161a(3) =531a(4) =1817a(5) =6411a(6) =23201a(7) =85731a(8) =322217a(9) =1227771a(10) =4729841a(11) =18379731a(12) =71908217a(13) =282817131a(14) =1116854081a(15) =4424238531a(16) =17567551817a(17) =69882262491a(18) =278365739921