T(2n+1,n+2), T given by A026769.

Terms

a(0) =1a(1) =5a(2) =22a(3) =95a(4) =413a(5) =1823a(6) =8196a(7) =37568a(8) =175542a(9) =835526a(10) =4046264a(11) =19909703a(12) =99391155a(13) =502637329a(14) =2571355930a(15) =13288938738a(16) =69296856372a(17) =364220714252