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Search: id:A027180
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A027180 a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=n, T given by A027170. +0
1
1, 7, 27, 79, 199, 459, 1003, 2119, 4383, 8947, 18115, 36495, 73303, 146971, 294363, 589207, 1178959, 2358531, 4717747, 9436255, 18873351, 37747627, 75496267, 150993639, 301988479, 603978259, 1207957923, 2415917359 (list; graph; listen)
OFFSET

0,2
FORMULA

18*2^n - 2n^2 - 10n - 17.

CROSSREFS

Sequence in context: A007715 A039623 A005585 this_sequence A036597 A038092 A059823

Adjacent sequences: A027177 A027178 A027179 this_sequence A027181 A027182 A027183

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified December 6 19:58 EST 2009. Contains 170429 sequences.

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