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A084518 Partial sums of A084519. Positions of ones in the first differences of A084516. 2
1, 2, 5, 18, 65, 238, 877, 3234, 11929, 44006, 162341, 598890, 2209361, 8150542, 30068125, 110924178, 409209865, 1509614198, 5569110677, 20544980154, 75792390209, 279605352286, 1031490797581, 3805267877730, 14037995932921 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

Index entries for linear recurrences with constant coefficients, signature (3, 2, 2).

FORMULA

Empirical G.f.: x*(1-2*x-2*x^2)/((1-x)*(1-3*x-2*x^2-2*x^3)). [Colin Barker, Apr 17 2012]

MATHEMATICA

Accumulate[LinearRecurrence[{3, 2, 2}, {1, 1, 3}, 30]] (* Harvey P. Dale, Jul 20 2013 *)

CROSSREFS

Sequence in context: A148429 A093635 A024025 * A150014 A150015 A150016

Adjacent sequences:  A084515 A084516 A084517 * A084519 A084520 A084521

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jun 02 2003

STATUS

approved

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Last modified August 23 13:45 EDT 2019. Contains 326227 sequences. (Running on oeis4.)