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A111712
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Arithmetic mean of the n-th row of triangle mentioned in A111710.
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2
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1, 3, 6, 10, 16, 22, 31, 39, 51, 61, 76, 88, 106, 120, 141, 157, 181, 199, 226, 246, 276, 298, 331, 355, 391, 417, 456, 484, 526, 556, 601, 633, 681, 715, 766, 802, 856, 894, 951, 991, 1051, 1093, 1156, 1200, 1266, 1312, 1381, 1429, 1501, 1551, 1626, 1678
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(1)=1, a(2n) = a(2n-1)+2n, a(2n+1)=a(2n)+3n. a(n) = A117111(n)+floor(n/2). - Frank Adams-Watters (FrankTAW(AT)Netscape.net), May 01 2006
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EXAMPLE
| a(4) = (8+9+10+13)/4 =10
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CROSSREFS
| Cf. A111710, A111711.
Sequence in context: A153453 A025215 A049697 * A194144 A025701 A025744
Adjacent sequences: A111709 A111710 A111711 * A111713 A111714 A111715
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KEYWORD
| easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 24 2005
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EXTENSIONS
| More terms from Frank Adams-Watters (FrankTAW(AT)Netscape.net), May 01 2006
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