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A004040 Inversion of A000257. +0
2
1, 2, 6, 23, 103, 512, 2740, 15485, 91245, 555662, 3475090, 22214707, 144640291, 956560748, 6411521056, 43478151737, 297864793993 (list; graph; listen)
OFFSET

0,2

FORMULA

Invert: define b by 1+Sum a(n)x^n = 1/(1 - Sum b(n)x^n).

CROSSREFS

Essentially the same as A022558.

Sequence in context: A050389 A098746 A088929 this_sequence A022558 A005802 A061552

Adjacent sequences: A004037 A004038 A004039 this_sequence A004041 A004042 A004043

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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