First differences of A087235.

Terms

a(0) =25a(1) =87a(2) =240a(3) =774a(4) =1960a(5) =5378a(6) =15828a(7) =40420a(8) =110477a(9) =306255a(10) =823267a(11) =2219935a(12) =6035446a(13) =16314684a(14) =44245201a(15) =119849369a(16) =324308909a(17) =879921037a(18) =2385657333a(19) =6467079803a(20) =17541637367a(21) =47581552613a(22) =129104928784a(23) =350330765356a(24) =950772205549