id:A026567 - OEIS Search Results

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a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=2n, T given by A026552.

+0
3

1, 4, 13, 31, 85, 193, 517, 1165, 3109, 6997, 18661, 41989, 111973, 251941, 671845, 1511653, 4031077, 9069925, 24186469, 54419557, 145118821, 326517349, 870712933, 1959104101, 5224277605, 11754624613, 31345665637, 70527747685 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: (1+3x+3x^2)/[(1-x)(1-6x^2)]. Cf. A026565. - Ralf Stephan, Feb 03 2004`
	CROSSREFS	`Adjacent sequences: A026564 A026565 A026566 this_sequence A026568 A026569 A026570` `Sequence in context: A116411 A106337 A027998 this_sequence A036487 A011936 A037235`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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