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A168591 a(n) = sum of the n-th power of the trinomial coefficients in row n of triangle A027907. 1
1, 3, 19, 831, 281907, 764206503, 16955359883149, 3120135986465328015, 4819828380706011142058787, 63004580363300194268932114354503, 7017256966823394610075464951176481843849 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..10.

FORMULA

Ignoring initial term, equals the logarithmic derivative of A168590.

PROG

(PARI) a(n)=sum(k=0, 2*n, polcoeff((1+x+x^2)^n, k)^n)

CROSSREFS

Cf. A168590, A027907.

Sequence in context: A136372 A272571 A107706 * A114301 A258669 A192340

Adjacent sequences:  A168588 A168589 A168590 * A168592 A168593 A168594

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Dec 01 2009

STATUS

approved

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Last modified February 25 03:33 EST 2018. Contains 299630 sequences. (Running on oeis4.)