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Search: id:A151798
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A151798 1, 2, 4, 4, 4, 4, ... +0
2
1, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 (list; graph; listen)
OFFSET

0,2

COMMENT

The INVERT transform gives A077996 without A077996(0). The Motzkin transform gives A105696 without A105696(0). Serves also as the decimal expansion of 28/225. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 29 2009]

a(n)=4-3*(A000007)-2*(A063524) [From Paolo P. Lava (ppl(AT)spl.at), Jul 16 2009]

FORMULA

a(n)=4-3*[C(2*n,n) mod 2]-2*[C((n+1)^2,n+3) mod 2], with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Jul 16 2009]

CROSSREFS

Partial sums give A131098.

Sequence in context: A036264 A105192 A040002 this_sequence A035684 A049111 A096509

Adjacent sequences: A151795 A151796 A151797 this_sequence A151799 A151800 A151801

KEYWORD

nonn

AUTHOR

David Applegate (david(AT)research.att.com), Jun 29 2009

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.


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