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floor[ E_(n+1)/E_(n) ] where E_n is n-th Euler number (see A028296 and A000364).

+0
4

5, 12, 22, 36, 53, 73, 97, 124, 154, 187, 223, 263, 306, 352, 402, 454, 510, 569, 632, 697, 766, 838, 914, 992, 1074, 1159, 1248, 1339, 1434, 1532, 1634, 1738, 1846, 1957, 2071, 2189, 2310, 2434, 2561, 2691, 2825, 2962, 3102, 3246, 3393, 3542, 3696, 3852 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`First nine terms are identical to those of A025740.`
	REFERENCES	`Peters J. and Stein J. - Matematische Tafeln . Revised Russian Edition in 1968, Moscow, Table 9b.`
	FORMULA	`a(n)=[ E(n+1)/E(n) ] where E(n) is n-th coefficient in expansion of sec(x).`
	MATHEMATICA	`Wolfram: ae[ x_ ] := Abs[ EulerE[ 2*x ] ] and fo[ x_ ] := Floor[ N[ ae[ x ]/ae[ x-1 ], 80 ] ]`
	CROSSREFS	`Cf. A028296, A000364, A025740.` `Sequence in context: A000326 A022795 A025734 this_sequence A025740 A054307 A126573` `Adjacent sequences: A034968 A034969 A034970 this_sequence A034972 A034973 A034974`
	KEYWORD	`nonn,easy`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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