Row 4 of rectangular table A124460.

Terms

a(0) =1a(1) =5a(2) =19a(3) =73a(4) =302a(5) =1325a(6) =6032a(7) =28193a(8) =134825a(9) =659011a(10) =3290110a(11) =16764206a(12) =87103106a(13) =461090076a(14) =2484768459a(15) =13621130998a(16) =75906831145a(17) =429768775851