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Line 1,320: '''Infinite sequence of terms of OEIS A001045 ''' return jacobsthalish([(0, 1])) # jacobsthalish :: (Int, Int) -> [Int] def jacobsthalish(xsab): '''Infinite sequence of jacobsthal-type series beginning with a, b ''' def go(ysxs): a, t = ysxs return a, t + [2 a + t[0]] return unfoldr(go)(xslist(ab)) Line 1,348: ( 'Jacobsthal-Lucas numbers', 30, jacobsthalish([(2, 1])) ), (

Jacobsthal numbers (view source)