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A081589 Third row of Pascal-(1,5,1) array A081580. 5
1, 13, 61, 145, 265, 421, 613, 841, 1105, 1405, 1741, 2113, 2521, 2965, 3445, 3961, 4513, 5101, 5725, 6385, 7081, 7813, 8581, 9385, 10225, 11101, 12013, 12961, 13945, 14965, 16021, 17113, 18241, 19405, 20605, 21841, 23113, 24421, 25765, 27145 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n)=1-6n+18n^2. G.f. (1+5x)^2/(1-x)^3.

CROSSREFS

Cf. A016921, A081590.

Sequence in context: A140615 A086361 A119151 * A139880 A127876 A047673

Adjacent sequences:  A081586 A081587 A081588 * A081590 A081591 A081592

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 23 2003

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Last modified February 15 23:21 EST 2012. Contains 205860 sequences.