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A086462 Expansion of (1+x)(1+4x)/((1-x)(1-4x)). 1
1, 10, 50, 210, 850, 3410, 13650, 54610, 218450, 873810, 3495250, 13981010, 55924050, 223696210, 894784850, 3579139410, 14316557650, 57266230610, 229064922450, 916259689810, 3665038759250, 14660155037010, 58640620148050 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

Index entries for linear recurrences with constant coefficients, signature (5,-4).

FORMULA

a(0)=1, a(1)=10, a(2)=50, a(n)=5a(n-1)-4a(n-2); a(n)=10(4^n-1)/3+0^n=10*A002450(n)+0^n=10*A001045(2n)+0^n.

CROSSREFS

Sequence in context: A006542 A237655 A261648 * A201830 A192019 A201210

Adjacent sequences:  A086459 A086460 A086461 * A086463 A086464 A086465

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Jul 21 2003

STATUS

approved

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Last modified February 21 14:40 EST 2018. Contains 299414 sequences. (Running on oeis4.)