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Bell numbers: Difference between revisions
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→{{header|REXX}}: added a comment in the REXX section header.
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A little optimization was added in calculating the factorial of a number by using memoization.
Also, see this task's ''discussion'' to view how the sizes of Bell numbers increase in relation to its index.
<lang rexx>/*REXX program calculates and displays a range of Bell numbers (index starts at zero).*/
parse arg LO HI . /*obtain optional arguments from the CL*/
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