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A107948 Terms at positions 2^n of A107946 for n>=0. 4
1, 1, 2, 5, 16, 68, 399, 3348, 41417, 775234, 22445788, 1024347395, 74876701760, 8888457145166, 1734062627778860 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

FORMULA

a(n) = A107946(2^n).

PROG

(PARI) {a(n)=local(A=[1, 1], B=[1]); for(i=1, n-1, B=concat(B, vector(#B, k, polcoeff(Ser(A)/(1-x), #B+k-1))); A=concat(A, B); ); A[2^(n-1)]}

CROSSREFS

Cf. A107946, A107947.

Sequence in context: A006116 A122082 A002631 * A220840 A058673 A296675

Adjacent sequences:  A107945 A107946 A107947 * A107949 A107950 A107951

KEYWORD

nonn

AUTHOR

Paul D. Hanna, May 28 2005

STATUS

approved

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Last modified November 22 18:55 EST 2019. Contains 329410 sequences. (Running on oeis4.)