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A105618
Row sums of triangle A105615.
1
1, 3, 15, 107, 991, 11203, 148879, 2270027, 39041151, 747704963, 15784630159, 364256650027, 9124264794271, 246600188525123, 7153677209063439, 221729176945261067, 7313478624348963391, 255786689421734222083
OFFSET
0,2
PROG
(PARI) {a(n)=if(n<0, 0, sum(k=0, n, (matrix(n+1, n+1, m, j, if(m>=j, if(m==j, 1, if(m==j+1, -2*j, polcoeff(1/sum(i=0, m-j, (2*i)!/i!/2^i*x^i)+O(x^m), m-j)))))^-1)[n+1, k+1]))}
CROSSREFS
Cf. A105615.
Sequence in context: A120016 A349874 A074519 * A120732 A245835 A362354
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Apr 16 2005
STATUS
approved