id:A023855 - OEIS Search Results

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a(n) = s(1)s(n)+s(2)s(n-1)+...+s(k)s(n+1-k), where k=[ (n+1)/2 ] and s = (natural numbers).

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1, 2, 7, 10, 22, 28, 50, 60, 95, 110, 161, 182, 252, 280, 372, 408, 525, 570, 715, 770, 946, 1012, 1222, 1300, 1547, 1638, 1925, 2030, 2360, 2480, 2856, 2992, 3417, 3570, 4047, 4218, 4750, 4940, 5530, 5740, 6391, 6622, 7337, 7590, 8372, 8648, 9500, 9800, 10725, 11050 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`G.f.: [x(1+x+2x^2)]/[(1-x)^4(1+x)^3]. - Ralf Stephan, Apr 28 2004`
	CROSSREFS	`Sequence in context: A155171 A049830 A022302 this_sequence A066964 A066967 A032007` `Adjacent sequences: A023852 A023853 A023854 this_sequence A023856 A023857 A023858`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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