First differences of A060530.

Terms

a(0) =1a(1) =217a(2) =22597a(3) =680945a(4) =9490490a(5) =80581316a(6) =486166212a(7) =2286928302a(8) =8905291815a(9) =29900133355a(10) =89103652231a(11) =240740576407a(12) =599256323432