Positions of 1 in A328018.

Terms

a(0) =1a(1) =7a(2) =35a(3) =119a(4) =387a(5) =1050a(6) =2786a(7) =7160a(8) =17157a(9) =39087a(10) =78453a(11) =167183a(12) =344072a(13) =697116a(14) =1310344a(15) =2455274a(16) =4569557a(17) =7758203a(18) =13461761a(19) =23063807a(20) =39017035a(21) =66702580a(22) =106675941a(23) =172270944a(24) =274763136a(25) =437839603a(26) =693741098a(27) =1044076002a(28) =1596344378a(29) =2414009807