First column of A083798.

Terms

a(0) =0a(1) =1a(2) =5a(3) =13a(4) =23a(5) =47a(6) =59a(7) =59a(8) =839a(9) =1679a(10) =2519a(11) =15119a(12) =27719a(13) =138599a(14) =360359a(15) =360359a(16) =720719a(17) =8648639a(18) =12252239a(19) =208288079a(20) =232792559a(21) =232792559a(22) =232792559a(23) =2327925599a(24) =5354228879a(25) =16062686639a(26) =26771144399a(27) =26771144399a(28) =80313433199