Numbers k that divide s(k-1), where s(1) = 1, s(k) = s(k-1) + (k+1)*3^k.

Terms

a(0) =4a(1) =13a(2) =35a(3) =52a(4) =95a(5) =119a(6) =169a(7) =676a(8) =11596a(9) =57577a(10) =159484a(11) =276773a(12) =360139a(13) =1345747a(14) =56193997a(15) =60640957a(16) =604170268a(17) =807129973a(18) =14161491721a(19) =44013617932a(20) =66076109593a(21) =78910928161a(22) =982436183855