Initial data commit

Task/Mutual-recursion/IS-BASIC/mutual-recursion.basic

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+100 PROGRAM "Hofstad.bas"
+110 PRINT "F sequence:"
+120 FOR I=0 TO 20
+130   PRINT F(I);
+140 NEXT
+150 PRINT :PRINT "M sequence:"
+160 FOR I=0 TO 20
+170   PRINT M(I);
+180 NEXT
+190 DEF F(N)
+200   IF N=0 THEN
+210     LET F=1
+220   ELSE
+230     LET F=N-M(F(N-1))
+240   END IF
+250 END DEF
+260 DEF M(N)
+270   IF N=0 THEN
+280     LET M=0
+290   ELSE
+300     LET M=N-F(M(N-1))
+310   END IF
+320 END DEF