A202148 Sum of rows of the triangle in A080381.

1, 2, 4, 8, 12, 32, 36, 100, 132, 392, 384, 1168, 1500, 5332, 5284, 15740, 16804, 60896, 62872, 222948, 243780, 927176, 876004, 2999432, 3284180, 12706832, 12636656, 45043700, 46679920, 176783132, 177597976, 652158968, 700632804, 2696835032, 2735898216

Offset

0,2

Links

Table of n, a(n) for n=0..34.

Example

a(0)= 1.
a(4)= 1 + 2 + 6 + 2 + 1 = 12.

Mathematica

Table[Total[Table[GCD[Binomial[n, j], Binomial[n, Floor[n/2]]], {j, 0, n}]], {n, 0, 50}]

Crossrefs

Cf. A080381.

Sequence in context: A076745 A007374 A105207 * A215825 A177268 A289085

Adjacent sequences: A202145 A202146 A202147 * A202149 A202150 A202151

Keyword

nonn

Author

Jacques ALARDET, Dec 12 2011

Status

approved