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A111581 G.f.: A(x) = ( G(x)^2 - G(x^2) - 2*x/(1-x^2) )/(4*x^2) where G(x) is the g.f. of A110627. 1
1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 8, 8, 9, 9, 10, 10, 11, 12, 12, 14, 14, 15, 16, 16, 17, 17, 18, 19, 19, 21, 20, 21, 22, 22, 24, 24, 25, 26, 27, 29, 29, 31, 32, 32, 34, 34, 35, 36, 37, 38, 39, 40, 41, 42, 44, 44, 45, 46, 47, 48, 49, 49, 50, 50, 51, 51, 52, 53, 53, 55, 55, 56, 57, 57 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

A110627 is the bisection of A083952; surprisingly, the self-convolution of A110627 is congruent modulo 4 to A083952, which consists entirely of 1's and 2's.

LINKS

Table of n, a(n) for n=0..73.

CROSSREFS

Cf. A110627, A083952.

Sequence in context: A248958 A030719 A126027 * A116572 A342517 A062049

Adjacent sequences:  A111578 A111579 A111580 * A111582 A111583 A111584

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Aug 28 2005

STATUS

approved

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Last modified May 10 14:04 EDT 2021. Contains 343770 sequences. (Running on oeis4.)