A partial product representation of A006131 and A072265.

Terms

a(0) =1a(1) =1a(2) =13a(3) =9a(4) =101a(5) =5a(6) =701a(7) =49a(8) =361a(9) =29a(10) =31021a(11) =33a(12) =204101a(13) =181a(14) =1021a(15) =1889a(16) =8799541a(17) =233a(18) =57746701a(19) =1361a(20) =41581a(21) =7589a(22) =2486401661a(23) =1633a(24) =161532401a(25) =49661a(26) =22810681a(27) =58241a(28) =702418373381a(29) =2245