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A018905
Duplicate of A024537.
0
2, 4, 9, 21, 50, 120, 289, 697, 1682, 4060, 9801, 23661, 57122, 137904, 332929
OFFSET
0,1
CROSSREFS
Sequence in context: A355046 A275864 A343264 * A024537 A171842 A296201
KEYWORD
dead
STATUS
approved