5-fold convolution of A001700(n), n >= 0.

Terms

a(0) =1a(1) =15a(2) =140a(3) =1045a(4) =6835a(5) =40963a(6) =230720a(7) =1240740a(8) =6437890a(9) =32468470a(10) =160010280a(11) =773624615a(12) =3680728375a(13) =17274086235a(14) =80119845080a(15) =367821324040