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A236856 Partial sums of A003418 starting summing from A003418(1), with a(0) = 0. 5
0, 1, 3, 9, 21, 81, 141, 561, 1401, 3921, 6441, 34161, 61881, 422241, 782601, 1142961, 1863681, 14115921, 26368161, 259160721, 491953281, 724745841, 957538401, 6311767281, 11665996161, 38437140561, 65208284961, 145521718161, 225835151361, 2554924714161 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Similar comments about the trailing digits apply here as in A173185.

a(n) gives the position of the last element of row n in irregular tables like A238280.

From a(2)=3 onward all terms are divisible by three.

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..250

FORMULA

a(n) = A173185(n)-1.

PROG

(Scheme) (define (A236856 n) (if (< n 2) n (+ (A236856 (- n 1)) (A003418 n))))

CROSSREFS

One less than A173185.

Cf. A003418, A007489, A231722, A236857, A236858.

Sequence in context: A326313 A073947 A062811 * A318843 A001470 A118932

Adjacent sequences:  A236853 A236854 A236855 * A236857 A236858 A236859

KEYWORD

nonn

AUTHOR

Antti Karttunen, Feb 27 2014

STATUS

approved

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Last modified July 13 16:22 EDT 2020. Contains 335688 sequences. (Running on oeis4.)