A057747 - OEIS

A057747

Number of decompositions of 2n-1 into sum of a lucky number and an even-lucky-number (from A045954).

0, 1, 2, 2, 2, 3, 4, 3, 3, 5, 4, 4, 5, 6, 4, 4, 5, 7, 6, 5, 5, 8, 6, 6, 6, 8, 8, 9, 8, 8, 7, 6, 7, 8, 9, 9, 9, 9, 10, 10, 7, 10, 13, 8, 9, 11, 10, 8, 9, 10, 12, 10, 12, 9, 12, 11, 10, 12, 14, 12, 15, 12, 10, 12, 10, 13, 16, 11, 13, 16, 14, 11, 15, 15, 13, 17, 15, 12, 13, 10, 12, 18, 14, 11

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OFFSET

1,3

LINKS

Jinyuan Wang, Table of n, a(n) for n = 1..1000

EXAMPLE

1 is not the sum of a lucky number and an even-lucky-number, so a(1)=0; 3=1+2 (one way, so a(2)=1); 5=3+2=1+4 (so a(3)=2); etc.

CROSSREFS

Cf. A000959, A045954.

Sequence in context: A366636 A366655 A057748 * A281965 A228074 A152803

Adjacent sequences: A057744 A057745 A057746 * A057748 A057749 A057750

KEYWORD

nonn,easy

AUTHOR

Naohiro Nomoto, Oct 30 2000

EXTENSIONS

Offset changed to 1 by Jinyuan Wang, Apr 07 2020

STATUS

approved