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A026330 a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 2, s(2n) =n+1. Also a(n) = T(2n,n+1), where T is the array in A026323. 0
0, 3, 16, 90, 504, 2849, 16224, 92988, 535840, 3101769, 18023856, 105076972, 614318040, 3600356175, 21146233920, 124436295054, 733493553408, 4330155834122, 25597817572320, 151508857016244, 897759260100648, 5325078489063039 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..21.

CROSSREFS

Sequence in context: A163604 A151329 A026111 * A146963 A074562 A130744

Adjacent sequences:  A026327 A026328 A026329 * A026331 A026332 A026333

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified April 11 04:05 EDT 2021. Contains 342886 sequences. (Running on oeis4.)