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A189713
Central terms of Zorach additive triangle (cf. A035312).
4
1, 6, 23, 56, 168, 459, 1080, 2400, 5461, 12678, 28728, 63336, 138717, 303346, 663179, 1438098, 3062730, 6450121, 13583957, 28627773, 59954459, 124413466, 258510987, 543867101, 1152248068, 2428235533, 5069886692, 10511339217, 21696371682, 44710463120
OFFSET
0,2
COMMENTS
a(n) = A035312(2*n,n).
PROG
(Haskell) -- See link.
CROSSREFS
Sequence in context: A272922 A234729 A273500 * A162267 A009017 A273540
KEYWORD
nonn,changed
AUTHOR
Reinhard Zumkeller, Apr 30 2011
STATUS
approved