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A340495 Records in first differences of A340494. 3
2, 3, 8, 33, 138, 563, 2268, 9093, 36398, 145623, 582528, 2330153, 9320658, 37282683, 149130788, 596523213, 2386092918, 9544371743, 38177487048, 152709948273, 610839793178, 2443359172803 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..22.

Rémy Sigrist, C program for A340495

FORMULA

The sequence a(n)-4*a(n-1) appears to be -5, -4, 1, 6, 11, 16, 21, 26, 31, 36, 41, 46, ... which is essentially 5*k+1 (k >= -1). The sequence itself appears to have g.f. =

     x*(2*x-1)*(2*x^2+5*x-2)/((1-x)^2*(1-4*x)).

PROG

(C) See Links section.

CROSSREFS

Cf. A340488, A340494.

Sequence in context: A162074 A162052 A082569 * A084908 A078742 A005370

Adjacent sequences:  A340492 A340493 A340494 * A340496 A340497 A340498

KEYWORD

nonn,more

AUTHOR

Rémy Sigrist and N. J. A. Sloane, Jan 10 2021

STATUS

approved

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Last modified June 20 04:43 EDT 2021. Contains 345157 sequences. (Running on oeis4.)