A081553 - OEIS

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A081553

Sum of n-th row of A081551.

1, 21, 303, 4006, 50010, 600015, 7000021, 80000028, 900000036, 1000000045, 10000000055, 100000000066 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(n) = n*10^(n-1) + n(n-1)/2.`
	CROSSREFS	`Cf. A081551, A081552.` `Sequence in context: A079517 A021784 A019618 * A021524 A021268 A018069` `Adjacent sequences: A081550 A081551 A081552 * A081554 A081555 A081556`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 01 2003`

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Last modified February 14 20:13 EST 2012. Contains 205663 sequences.