

A154324


Diagonal sums of number triangle A113582.


0



1, 1, 2, 3, 6, 12, 23, 43, 74, 124, 195, 300, 441, 637, 890, 1226, 1647, 2187, 2848, 3673, 4664, 5874, 7305, 9021, 11024, 13390, 16121, 19306, 22947, 27147, 31908, 37348, 43469, 50405, 58158, 66879, 76570, 87400, 99371, 112671, 127302
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OFFSET

0,3


LINKS

Table of n, a(n) for n=0..40.
Index entries for linear recurrences with constant coefficients, signature (3,0,8,6,6,8,0,3,1).


FORMULA

G.f.: (12xx^2+5x^3x^42x^5+x^6)/((1x)*(1x^2))^3; a(n)=sum{k=0..floor(n/2), 1+C(k+1,2)*C(n2k+1,2)}.


CROSSREFS

Sequence in context: A068012 A261930 A019138 * A001630 A164363 A103341
Adjacent sequences: A154321 A154322 A154323 * A154325 A154326 A154327


KEYWORD

easy,nonn


AUTHOR

Paul Barry, Jan 07 2009


STATUS

approved



