A054149 T(2n-1,n), array T as in A054144.

1, 14, 84, 410, 1820, 7648, 31008, 122584, 475600, 1818656, 6874560, 25742624, 95645888, 353032960, 1295729664, 4732541824, 17211685120, 62362187264, 225201546240, 810825419264, 2911520685056, 10429433085952

Offset: 1

Author

Clark Kimberling, Mar 18 2000

Keywords

• nonn

Formula

Conjectures from Colin Barker, Feb 11 2015: (Start)

a(n) = 8*a(n-1)-20*a(n-2)+16*a(n-3)-4*a(n-4).

G.f.: x*(2*x^3-8*x^2+6*x+1) / (2*x^2-4*x+1)^2.

(End)