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A026682 T(2n,n), T given by A026681. 1
1, 3, 10, 44, 174, 822, 3414, 16604, 70600, 348828, 1503802, 7504156, 32645122, 164014374, 718098056, 3625748104, 15950473396, 80839381968, 356946436186, 1814421022372, 8035178656538, 40941855317034, 181746522965214, 927880523400340 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Robert Israel, Table of n, a(n) for n = 0..1456

MAPLE

T:= proc(n, k) option remember;

if k=0 or k=n then return 1 fi;

if min(k, n-k)::even then procname(n-1, k-1)+procname(n-1, k)

else procname(n-1, k-1)+procname(n-2, k-1)+procname(n-1, k)

fi

end proc:

seq(T(2*n, n), n=0..40); # Robert Israel, Jul 16 2019

CROSSREFS

Sequence in context: A331156 A279105 A246956 * A335635 A096804 A113059

Adjacent sequences:  A026679 A026680 A026681 * A026683 A026684 A026685

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 12 08:13 EDT 2021. Contains 344943 sequences. (Running on oeis4.)