Jacobsthal numbers: Difference between revisions

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 # jacobsthalish :: (Int, Int) -> [Int]
-def jacobsthalish(ab):
+def jacobsthalish(xy):
     '''Infinite sequence of jacobsthal-type series
        beginning with a, b
     '''
-    def go(xs):
+    def go(ab):
-        a, *t = xs
+        a, b = ab
-        return a, t + [2 * a + t[0]]
+        return a, [b, 2 * a + b]
-    return unfoldr(go)(list(ab))
+    return unfoldr(go)(xy)