import std.experimental.all; void main() { // 初項 1, 公差 2 auto a = recurrence!((a, n) => a[n-1] + 2)(1); writeln(a.take(10)); //=> [1, 3, 5, 7, 9, 11, 13, 15, 17, 19] // 初項 3, 公比 2 auto b = recurrence!((a, n) => a[n-1] * 2)(3); writ…