Row sums of A258310.

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =26a(5) =86a(6) =392a(7) =1660a(8) =9065a(9) =46705a(10) =297984a(11) =1805926a(12) =13186497a(13) =91788477a(14) =754481662a(15) =5924676900a(16) =54092804430a(17) =472512732558