Fifth column of triangle A028364.

Terms

a(0) =42a(1) =90a(2) =255a(3) =785a(4) =2529a(5) =8398a(6) =28511a(7) =98462a(8) =344720a(9) =1220532a(10) =4362438a(11) =15718149a(12) =57028063a(13) =208164950a(14) =763915215a(15) =2816707650a(16) =10429892340a(17) =38768134380a(18) =144600329250a(19) =541036998090