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A027276 a(n) = Sum_{k=0..2n} (k+1) * A026552(n, k). 0
1, 6, 27, 72, 270, 648, 2268, 5184, 17496, 38880, 128304, 279936, 909792, 1959552, 6298560, 13436928, 42830208, 90699264, 287214336, 604661760, 1904684544, 3990767616, 12516498432, 26121388032, 81629337600, 169789022208 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

FORMULA

G.f.: (1+6x+15x^2-18x^3)/(1-6x^2)^2.

CROSSREFS

Sequence in context: A305158 A273408 A085788 * A101970 A136105 A239568

Adjacent sequences:  A027273 A027274 A027275 * A027277 A027278 A027279

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified July 11 01:30 EDT 2020. Contains 335600 sequences. (Running on oeis4.)