a(n) = sigma(sigma(p(n))) = sum of the divisors of the sum of the divisors of number of partitions of n.

A280101

a(n) = sigma(sigma(p(n))) = sum of the divisors of the sum of the divisors of number of partitions of n.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =7a(4) =12a(5) =15a(6) =28a(7) =60a(8) =91a(9) =195a(10) =252a(11) =360a(12) =252a(13) =216a(14) =744a(15) =896a(16) =1020a(17) =1512a(18) =1651a(19) =2400a(20) =3048a(21) =7644a(22) =6552a(23) =4800a(24) =6720a(25) =10890a(26) =24384a(27) =19812a(28) =17360a(29) =20160

External references