id:A158095 - OEIS Search Results

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G.f.: A(x) = exp( Sum_{n>=1} 2*sigma(n,n-1)*x^n/n ).

+0
2

1, 2, 5, 14, 61, 370, 3454, 40880, 614346, 10848514, 222870183, 5175100204, 134514302384, 3859406052466, 121274242936381, 4139268759072626, 152532132931199062, 6034430112251517608, 255114747410233804986 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`G.f.: A(x) = 1 + 2x + 5x^2 + 14x^3 + 61x^4 + 370*x^5 +...`
	PROGRAM	`(PARI) a(n)=polcoeff(exp(sum(m=1, n, 2sigma(m, m-1)x^m/m)+x*O(x^n)), n)`
	CROSSREFS	`Cf. A023881.` `Sequence in context: A006847 A008286 A049082 this_sequence A059958 A102019 A097595` `Adjacent sequences: A158092 A158093 A158094 this_sequence A158096 A158097 A158098`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Mar 20 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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