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A262594 Expansion of (1-2*x)^2/((1-x)^4*(1-4*x)). 2
1, 4, 14, 52, 203, 808, 3232, 12936, 51765, 207100, 828466, 3313964, 13255999, 53024192, 212097028, 848388448, 3393554217, 13574217396, 54296870230, 217187481700, 868749927731, 3474999712024, 13899998849384, 55599995399032, 222399981597853, 889599926393388, 3558399705575802, 14233598822305756 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Suggested by A262592.

LINKS

Colin Barker, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (8,-22,28,-17,4).

FORMULA

From Colin Barker, Oct 23 2015: (Start)

a(n) = 8*a(n-1)-22*a(n-2)+28*a(n-3)-17*a(n-4)+4*a(n-5) for n>4.

a(n) = (34+2^(7+2*n)+93*n+18*n^2-9*n^3)/162.

(End)

PROG

(PARI) a(n) = (34+2^(7+2*n)+93*n+18*n^2-9*n^3)/162 \\ Colin Barker, Oct 23 2015

(PARI) Vec((1-2*x)^2/((1-x)^4*(1-4*x)) + O(x^40)) \\ Colin Barker, Oct 23 2015

CROSSREFS

Cf. A262592.

Sequence in context: A244935 A199698 A052710 * A284765 A129997 A308023

Adjacent sequences:  A262591 A262592 A262593 * A262595 A262596 A262597

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Oct 22 2015

STATUS

approved

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Last modified October 19 15:50 EDT 2019. Contains 328223 sequences. (Running on oeis4.)