Positions of zeros in A378505.

Terms

a(0) =0a(1) =3a(2) =12a(3) =39a(4) =65a(5) =78a(6) =158a(7) =237a(8) =357a(9) =537a(10) =807a(11) =2152a(12) =17224a(13) =27560a(14) =45935a(15) =76560a(16) =229683a(17) =306244a(18) =382805a(19) =459366a(20) =918734a(21) =1063635a(22) =1294860a(23) =1371935a(24) =1421263a(25) =3150013a(26) =6300026a(27) =8721659a(28) =26164977a(29) =34234782