a(n) = floor( Gamma(n+1/7)/Gamma(1/7) ).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =4a(6) =23a(7) =143a(8) =1027a(9) =8370a(10) =76527a(11) =776207a(12) =8649165a(13) =105025575a(14) =1380336141a(15) =19521896861a(16) =295617295326