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A054113 T(2n,n), array T as in A054110. 1
1, 5, 17, 57, 197, 701, 2549, 9413, 35153, 132393, 501905, 1912769, 7321081, 28122281, 108355481, 418590521, 1620751301, 6287963741, 24438234341, 95128761941, 370821819581, 1447337568461, 5655535495901, 22122396951101 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
G.f.: [ -1+4x+2*sqrt(1-4x)]/[(1-x)(1-4x)]. - Ralf Stephan, Apr 03 2004
a(n) = 4s(n)+1, with s(n) = A079309(n) = sum(k=1, n, C(2k+1, k+1)). - Ralf Stephan, Apr 03 2004
CROSSREFS
Sequence in context: A027097 A098184 A289590 * A146697 A009229 A010914
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)