Sum of proper divisors minus the number of proper divisors of Catalan number A000108(n).

A152988

Sum of proper divisors minus the number of proper divisors of Catalan number A000108(n).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =7a(5) =47a(6) =193a(7) =236a(8) =1579a(9) =4195a(10) =18461a(11) =62143a(12) =275781a(13) =1131909a(14) =7434169a(15) =10522660a(16) =72469339a(17) =268486155a(18) =1442237845a(19) =4284330539a(20) =18146555293a(21) =62021099893a(22) =248289236937a(23) =798007352239

External references