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A026553 a(n)=T(n,n), T given by A026552. Also a(n) = number of integer strings s(0),...,s(n) counted by T, such that s(n)=0. 0
1, 1, 3, 4, 12, 20, 58, 104, 300, 556, 1608, 3032, 8806, 16778, 48924, 93872, 274644, 529684, 1553940, 3008864, 8846772, 17184188, 50618184, 98577712, 290817566, 567591142, 1676640462, 3278348608, 9694857750, 18986482250 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..29.

CROSSREFS

Sequence in context: A124639 A279696 A279248 * A282220 A281892 A101727

Adjacent sequences:  A026550 A026551 A026552 * A026554 A026555 A026556

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 10 16:56 EDT 2020. Contains 336381 sequences. (Running on oeis4.)