Shadow of Euler's constant exp(1).

Terms

a(0) =1a(1) =3a(2) =10a(3) =28a(4) =309a(5) =317a(6) =601a(7) =606a(8) =696a(9) =700a(10) =752a(11) =787a(12) =1147a(13) =1434a(14) =1481a(15) =1494a(16) =2020a(17) =2026a(18) =2050a(19) =2059a(20) =2136a(21) =2193a(22) =4663a(23) =4756a(24) =4825a(25) =4924a(26) =4983a(27) =5557a(28) =5653a(29) =12620