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A027849 a(n) = (n+1)*(5*n^2+4*n+1). 2
1, 20, 87, 232, 485, 876, 1435, 2192, 3177, 4420, 5951, 7800, 9997, 12572, 15555, 18976, 22865, 27252, 32167, 37640, 43701, 50380, 57707, 65712, 74425, 83876, 94095, 105112, 116957, 129660, 143251 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..30.

FORMULA

From Chai Wah Wu, Jun 10 2016: (Start)

a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) for n > 3.

G.f.: (13*x^2 + 16*x + 1)/(x - 1)^4. (End)

CROSSREFS

Cf. A260260 (comment). [Bruno Berselli, Jul 22 2015]

Sequence in context: A268888 A211158 A154077 * A243645 A219824 A306987

Adjacent sequences:  A027846 A027847 A027848 * A027850 A027851 A027852

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 21 01:33 EST 2019. Contains 329349 sequences. (Running on oeis4.)