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A097713 Column 1 of triangle A097712. 1
1, 3, 8, 25, 111, 809, 10360, 236952, 9708797, 714862984, 95000655195, 22902964060238, 10070812803900694, 8120691251242651341, 12070960239863869828931, 33238610095183531376362138 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Equals the partial sums of A016121; the row sums of triangle A097712 equals A016121. A016121 equals the number of sequences (a_1, a_2, ..., a_n) of length n with a_1 = 1 satisfying a_i <= a_{i+1} <= 2*a_i.

LINKS

Table of n, a(n) for n=0..15.

CROSSREFS

Cf. A097712, A016121.

Sequence in context: A051403 A004205 A268114 * A009392 A130648 A061812

Adjacent sequences:  A097710 A097711 A097712 * A097714 A097715 A097716

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Aug 24 2004

STATUS

approved

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Last modified August 19 08:14 EDT 2019. Contains 326115 sequences. (Running on oeis4.)