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A038751 A variant of the recurrence for A001190. 2
0, 1, 1, 0, 1, 1, 2, 3, 6, 9, 18, 30, 60, 105, 210, 381, 765, 1425, 2868, 5454, 11004, 21210, 42930, 83673, 169851, 333843, 679602, 1345476, 2745636, 5467275, 11182365, 22379895, 45866418, 92180781, 189275955, 381831396, 785328636 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

LINKS

Table of n, a(n) for n=0..36.

MAPLE

A038751 := proc(n) option remember; local s, k; if n<=1 then RETURN(n); else s := 0; if n mod 2 = 0 then s := A038751(n/2) * (A038751(n/2) + 1)/2; for k from 1 to n/2 - 1 do s := s + A038751(k) * A038751(n - k); od; RETURN(s); else for k from 1 to (n - 1)/2 - 1 do s := s + A038751(k) * A038751(n - k); od; RETURN(s); fi; fi; end;

CROSSREFS

Cf. A001190, A038750.

Sequence in context: A107847 A059966 A095718 * A218543 A266925 A018518

Adjacent sequences:  A038748 A038749 A038750 * A038752 A038753 A038754

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 03 2000

STATUS

approved

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Last modified September 20 04:06 EDT 2019. Contains 327212 sequences. (Running on oeis4.)