4194324domain: NAppears in sequencesa(n) = 2^(n+1) + n - 1.at n=21A083706Duplicate of A083706.at n=21A122039Binomial transform of A113127; (1, 1, 3, 7, 15, 31, ...) convolved with (1, 3, 7, 15, 31, 63, ...).at n=17A181527