Zero together with the row sums of A288778.

Terms

a(0) =0a(1) =0a(2) =2a(3) =9a(4) =36a(5) =165a(6) =918a(7) =6111a(8) =47304a(9) =416097a(10) =4091130a(11) =44417043a(12) =527456556a(13) =6798432069a(14) =94499679582