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A357309
Number of ascent sequences of length 2n with n zeros.
2
1, 1, 6, 54, 660, 10255, 193732, 4312980, 110598510, 3210608808, 104085718451, 3727491264497, 146140031249576, 6225801069767760, 286376011804522536, 14145748008085964988, 746808042116142422388, 41964968782188114180606, 2500755433211714966201145
OFFSET
0,3
LINKS
FORMULA
a(n) = A175579(2n,n).
EXAMPLE
a(2) = 4: 0011, 0012, 0101, 0102, 0110, 0120.
CROSSREFS
Cf. A175579.
Sequence in context: A034001 A084062 A292633 * A137591 A292716 A356927
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 23 2022
STATUS
approved