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, 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

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