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A081553 Sum of n-th row of A081551. 2

%I

%S 1,21,303,4006,50010,600015,7000021,80000028,900000036,1000000045,

%T 10000000055,100000000066

%N Sum of n-th row of A081551.

%F a(n) = n*10^(n-1) + n(n-1)/2.

%Y Cf. A081551, A081552.

%K base,easy,nonn

%O 1,2

%A _Amarnath Murthy_, Apr 01 2003

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Last modified September 19 11:06 EDT 2019. Contains 327192 sequences. (Running on oeis4.)