1,1
Massachusetts contains 13 letters, so a(21) = 13.
Sequence in context: A093349 A020789 A153857 this_sequence A092902 A010512 A091343
Adjacent sequences: A093810 A093811 A093812 this_sequence A093814 A093815 A093816
nonn
Anonymous, May 20 2004
a(21) corrected by Joe Griggs, Aug 18 2009
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