The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A185759 A diagonal of triangle A185755. 4
 9, 154, 2340, 38325, 704102, 14570976, 337738758, 8697532008, 246819113442, 7660379273261, 258275171344333, 9403520522325228, 367786323703199388, 15381080863799688012, 684987041358431417024, 32366520461834117146792 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A185755(n,k) equals the coefficient of x^n*y^k in the n-th iteration of x*(1+xy)/(1-x). LINKS PROG (PARI) {a(n)=local(A=x, G=x*(1+x*y)/(1-x)); for(i=1, n+2, A=subst(G, x, A+O(x^(n+3)))); polcoeff(polcoeff(A, n+2, x), n-1, y)} CROSSREFS Cf. A185755, A185756, A185757, A185758. Sequence in context: A193540 A193543 A173982 * A215557 A208998 A236578 Adjacent sequences: A185756 A185757 A185758 * A185760 A185761 A185762 KEYWORD nonn AUTHOR Paul D. Hanna, Feb 03 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 28 04:25 EST 2023. Contains 359850 sequences. (Running on oeis4.)