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

Author

Reinhard Zumkeller, Jul 08 2011

Keywords

• nonn

Comments

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

Links

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

Crossrefs

Cf. A192736.

Programs

Haskell

See A033291.

Maple

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

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