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A176673
Partial sums of A001168.
1
1, 3, 9, 28, 91, 307, 1067, 3792, 13702, 50148, 185416, 691277, 2595167, 9800041, 37194707, 141787644, 542583488, 2083404030, 8024142706, 30988922366, 119972435149, 465505007827, 1809877343351, 7049866113619, 27507668129630
OFFSET
1,2
COMMENTS
Partial sums of number of fixed polyominoes with n cells, for n > 0.
LINKS
FORMULA
a(n) = Sum_{i=1..n} A001168(i).
EXAMPLE
a(6) = 1 + 2 + 6 + 19 + 63 + 216 = 307.
KEYWORD
nonn
AUTHOR
Jonathan Vos Post, Apr 23 2010
STATUS
approved