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A081492 Sum of terms in n-th row of A081491. 3
1, 5, 18, 54, 135, 291, 560, 988, 1629, 2545, 3806, 5490, 7683, 10479, 13980, 18296, 23545, 29853, 37354, 46190, 56511, 68475, 82248, 98004, 115925, 136201, 159030, 184618, 213179, 244935, 280116, 318960, 361713, 408629, 459970, 516006, 577015 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

For odd n a(n) is a multiple of n and a(n)/n is the middle term of the corresponding row.

FORMULA

n/3 * (2n^3 - 6n^2 + 13n - 3).

CROSSREFS

Cf. A002522, A005408, A081489, A081490, A081491.

Sequence in context: A127983 A056782 A178684 * A011845 A099450 A145129

Adjacent sequences:  A081489 A081490 A081491 * A081493 A081494 A081495

KEYWORD

nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2003

EXTENSIONS

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 29 2003

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Last modified February 15 08:20 EST 2012. Contains 205729 sequences.