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A062747 Row sums of (unsigned) staircase array A062746. 1
1, 7, 89, 1447, 26713, 532391, 11165785, 242851751, 5427716185, 123901026215, 2876525797465, 67710590623655, 1612262780199001, 38764533106581415, 939825790848884825, 22950405085586497447 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..15.

FORMULA

a(n)=N(3; k, x=-1), with the polynomials N(3; k, x) from the staircase array A062746.

a(n)=2*sum(((-1)^j))*C(3; n-j)*2^(n-j), j=0..n)-(-1)^n with C(3; n) := A001764(n)=A062993(n+1, 1) (a Pfaff-Fuss or 3-Raney sequence).

G.f.: (2*c(3; 2*x)-1)/(1+x) with c(3; x)= RootOf(x*_Z^3-_Z +1), the g.f. of A001764.

CROSSREFS

Sequence in context: A069661 A069662 A295543 * A099719 A142995 A200832

Adjacent sequences:  A062744 A062745 A062746 * A062748 A062749 A062750

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Jul 12 2001

STATUS

approved

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Last modified November 17 10:37 EST 2019. Contains 329225 sequences. (Running on oeis4.)