A192735 Left edge of the triangle in A033291.

1, 2, 6, 16, 30, 54, 91, 136, 198, 280, 374, 492, 637, 798, 990, 1216, 1462, 1746, 2071, 2420, 2814, 3256, 3726, 4248, 4825, 5434, 6102, 6832, 7598, 8430, 9331, 10272, 11286, 12376, 13510, 14724, 16021, 17366, 18798, 20320, 21894, 23562, 25327, 27148, 29070

Offset

1,2

Comments

a(n) = A087483(n-2) * n.

Links

Table of n, a(n) for n=1..45.

Index entries for linear recurrences with constant coefficients, signature (2,-1,2,-4,2,-1,2,-1).

Formula

G.f.: x*(x^2+1)*(2*x^4+4*x^3+2*x^2+1) / ((x-1)^4*(x^2+x+1)^2). - Colin Barker, Mar 31 2013

Maple

A192735 := proc(n)
    A087483(n-2)*n ;
end proc:
seq(A192735(n), n=1..10) ; # R. J. Mathar, Aug 10 2017

Prog

(Haskell) See A033291.

Crossrefs

Cf. A192736.

Sequence in context: A364666 A160620 A005996 * A330503 A171218 A032091

Adjacent sequences: A192732 A192733 A192734 * A192736 A192737 A192738

Keyword

nonn

Author

Reinhard Zumkeller, Jul 08 2011

Status

approved