A038751 A variant of the recurrence for A001190.

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

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