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A026538 a(n)=T(n,n-1), T given by A026536. Also a(n) = number of integer strings s(0),...,s(n), counted by T, such that s(n)=1. 0
1, 1, 3, 6, 13, 33, 65, 180, 346, 990, 1897, 5502, 10571, 30863, 59523, 174456, 337672, 992304, 1926650, 5673140, 11043858, 32571858, 63548069, 187675644, 366849016, 1084649644, 2123604927, 6284986554, 12322549765, 36501029265 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..30.

CROSSREFS

Sequence in context: A187780 A273974 A179928 * A201951 A104448 A062466

Adjacent sequences:  A026535 A026536 A026537 * A026539 A026540 A026541

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 20 00:52 EDT 2020. Contains 337897 sequences. (Running on oeis4.)