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A153126
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Sums of rows of the triangle in A153125.
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6
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1, 6, 18, 33, 55, 80, 112, 147, 189, 234, 286, 341, 403, 468, 540, 615, 697, 782, 874, 969, 1071, 1176, 1288, 1403, 1525, 1650, 1782, 1917, 2059, 2204, 2356, 2511, 2673, 2838, 3010, 3185, 3367, 3552, 3744, 3939, 4141, 4346, 4558, 4773, 4995, 5220, 5452
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Sequence found by reading the line from 1, in the direction 1, 6,..., and the same line from 1, in the direction 1, 18,..., in the square spiral whose edges have length A195013 and whose vertices are the numbers A195014. Line perpendicular to the main axis A195015 in the same spiral. - Omar E. Pol, Oct 14 2011
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FORMULA
| a(n) = n*(5*n+7)/2 + 1 - n Mod 2.
a(n) = Sum(A153125(n+1,k): 1<=k<=n+1);
a(2*n) = A033571(n); a(2*n+1) = A153127(n);
a(n) = A000566(n+1) - n mod 2.
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CROSSREFS
| Sequence in context: A017593 A096286 A124353 * A110671 A134078 A181510
Adjacent sequences: A153123 A153124 A153125 * A153127 A153128 A153129
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 20 2008
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