First differences of A038625.

Terms

a(0) =25a(1) =69a(2) =234a(3) =678a(4) =2051a(5) =5349a(6) =15118a(7) =41014a(8) =110657a(9) =305655a(10) =823646a(11) =2219386a(12) =6034071a(13) =16316797a(14) =44240660a(15) =119845770a(16) =324311229a(17) =879921169a(18) =2385656018a(19) =6467086046a(20) =17541630385a(21) =47581555131a(22) =129104931215a(23) =350330768077a(24) =950772203169