First differences of A161762.

Terms

a(0) =0a(1) =2a(2) =2a(3) =7a(4) =14a(5) =37a(6) =90a(7) =232a(8) =594a(9) =1541a(10) =4004a(11) =10441a(12) =27260a(13) =71254a(14) =186354a(15) =487579a(16) =1276002a(17) =3339821a(18) =8742470a(19) =22885996a(20) =59912930a(21) =156848617a(22) =410626152a(23) =1075018897a(24) =2814412824a(25) =7368190922a(26) =19290113570a(27) =50502074767a(28) =132215989334a(29) =346145696821