id:A151681 - OEIS Search Results

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a(n) = sum_{k >= 0, k even} binomial(wt(n+k),k+1), where wt() = A000120().

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1, 2, 1, 2, 2, 4, 1, 2, 2, 4, 2, 5, 4, 7, 1, 2, 2, 4, 2, 5, 4, 7, 2, 5, 4, 8, 5, 12, 7, 11, 1, 2, 2, 4, 2, 5, 4, 7, 2, 5, 4, 8, 5, 12, 7, 11, 2, 5, 4, 8, 5, 12, 7, 12, 5, 12, 8, 17, 12, 26, 11, 16, 1, 2, 2, 4, 2, 5, 4, 7, 2, 5, 4, 8, 5, 12, 7, 11, 2, 5, 4, 8, 5, 12, 7, 12, 5, 12, 8, 17, 12, 26, 11, 16 (list; graph; listen)

	OFFSET	`0,2`
	MAPLE	`wt := proc(n) local w, m, i; w := 0; m := n; while m > 0 do i := m mod 2; w := w+i; m := (m-i)/2; od; w; end:` `f:=proc(n) local t1, k; global wt; t1:=0; for k from 0 to 20 do if k mod 2 = 0 then t1:=t1+binomial(wt(n+k), k); fi; od; t1; end;`
	CROSSREFS	`Sequence in context: A048896 A130831 A151678 this_sequence A131097 A062790 A046640` `Adjacent sequences: A151678 A151679 A151680 this_sequence A151682 A151683 A151684`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jun 01 2009`

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

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