id:A080325 - OEIS Search Results

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Multiple of coefficients in expansion of 1/sin(x)^2.

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0, 1, 12, 320, 16128, 1382400, 186802176, 37571788800, 10752302776320, 4222605695385600, 2209155036594831360, 1502185604799843532800, 1300250162749167894528000, 1407357631537525272084480000 (list; graph; listen)

	OFFSET	`0,3`
	PROGRAM	`(PARI) a(n)=if(n<1, 0, (n+1)!(2n+1)!/4polcoeff(1/sin(x+O(x^(2n+2)))^2, 2*n-2))`
	CROSSREFS	`Sequence in context: A053064 A060010 A129583 this_sequence A083431 A080141 A110101` `Adjacent sequences: A080322 A080323 A080324 this_sequence A080326 A080327 A080328`
	KEYWORD	`nonn,easy`
	AUTHOR	`Michael Somos, Feb 14 2003`

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Last modified September 7 23:08 EDT 2008. Contains 143486 sequences.

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