Indices k where A057176(k) = 4.

Terms

a(0) =3a(1) =6a(2) =9a(3) =13a(4) =35a(5) =66a(6) =115a(7) =145a(8) =297a(9) =402a(10) =491a(11) =521a(12) =1217a(13) =2166a(14) =3397a(15) =3591a(16) =4641a(17) =4829a(18) =6810a(19) =6829a(20) =7978a(21) =8705a(22) =17676a(23) =21165a(24) =50722a(25) =52884a(26) =84763a(27) =121344a(28) =121482a(29) =162070