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A154699 Terms in A014217 pairwise swapped. 0
1, 1, 4, 2, 11, 6, 29, 17, 76, 46, 199, 122, 521, 321, 1364, 842, 3571, 2206, 9349, 5777, 24476, 15126, 64079, 39602, 167761, 103681, 439204, 271442, 1149851, 710646, 3010349, 1860497, 7881196, 4870846, 20633239, 12752042 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

We can build an auxiliary b(n)=a(n+1)-2a(n) = -1,2,-6,7,..., its bisection b(2n)=a(2n+2)-2a(2n), then take the first differences b(2n+2)-b(2n) = a(2n+4)-3*a(2n+2)+2*a(2n) = -5, -10, -25, -65 and have obtained -A106729(n).

LINKS

Table of n, a(n) for n=0..35.

FORMULA

a(2n)=A014217(2n+1). a(2n+1)=A014217(2n).

a(n)=4*a(n-2)-4*(n-4)+a(n-6). G.f.: (1+x-2x^3-x^4+2x^5)/((1-x)(1+x)(x^2+x-1)(x^2-x-1)). [R. J. Mathar, Jan 23 2009]

CROSSREFS

Sequence in context: A191434 A163918 A318784 * A213568 A185878 A182870

Adjacent sequences:  A154696 A154697 A154698 * A154700 A154701 A154702

KEYWORD

nonn

AUTHOR

Paul Curtz, Jan 14 2009

EXTENSIONS

Edited and extended by R. J. Mathar, Jan 23 2009

STATUS

approved

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Last modified May 26 18:08 EDT 2020. Contains 334630 sequences. (Running on oeis4.)