Starting at 1, four-fold convolution of A000400 (powers of 6).

A081144

Starting at 1, four-fold convolution of A000400 (powers of 6).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =24a(5) =360a(6) =4320a(7) =45360a(8) =435456a(9) =3919104a(10) =33592320a(11) =277136640a(12) =2217093120a(13) =17293326336a(14) =132058128384a(15) =990435962880

External references