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A005469
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a(n)=1+a([ n/2 ]) a( ceiling ( n/2 ) ).
(Formerly M1398)
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0
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2, 5, 11, 26, 56, 122, 287, 677, 1457, 3137, 6833, 14885, 35015, 82370, 194300, 458330, 986390, 2122850, 4570610, 9840770, 21435122, 46689890, 101709206, 221563226
(list; graph; refs; listen; history; internal format)
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