Sequence is {a(3,n)}, where a(m,n) is defined at sequence A111518.

Terms

a(0) =1a(1) =3a(2) =3a(3) =-3a(4) =-8a(5) =-1a(6) =-44a(7) =-151a(8) =259a(9) =-49a(10) =-5250a(11) =17176a(12) =18870a(13) =-443793a(14) =1765849a(15) =1813152a(16) =-60621125a(17) =321255514a(18) =-62856104a(19) =-11540412088a(20) =88870982824a(21) =-195655026297