A131267 Self-generated: 1=1*1; 2=1*1+1*1; 5=1*2+2*1+1*1; 12=1*5+2*2+2*1+1*1; 35=1*12+2*5+5*2+2*1+1*1; 97=1*35+2*12+5*5+5*2+2*1+1*1; ...

1, 2, 5, 12, 35, 97, 300, 886, 2884, 9038, 30119, 97044, 330178, 1093187, 3760857, 12642484, 44030988, 150422819, 527900140, 1820782288, 6438077940, 22426049665, 79685359338, 279367999565, 997882736275, 3522643337418

Offset

0,2

Links

Table of n, a(n) for n=0..25.

Maple

A131267 := proc(n) option remember ; local a, i ; if n <=0 then RETURN(1) ; else a :=0 ; for i from 0 to n do a := a+ A131267( min(i, n-i))*A131267(n-i-1) ; od: RETURN(a) ; fi ; end: seq(A131267(n), n=0..30) ; # R. J. Mathar, Oct 25 2007

Crossrefs

Sequence in context: A101292 A350441 A181899 * A266931 A148286 A075202

Adjacent sequences: A131264 A131265 A131266 * A131268 A131269 A131270

Keyword

nonn

Author

Paul Curtz, Sep 28 2007

Extensions

More terms from R. J. Mathar, Oct 25 2007

Status

approved