A106189 Expansion of 1/((1-2x^2)sqrt(1-4x)).

1, 2, 8, 24, 86, 300, 1096, 4032, 15062, 56684, 214880, 818800, 3133916, 12038200, 46384432, 179193920, 693849254, 2691994060, 10462833808, 40729251920, 158772196436, 619716378280, 2421643356592, 9472863484160, 37090890396284

Offset: 0

Author

Paul Barry, Apr 24 2005

Keywords

• easy
• nonn

Comments

Diagonal sums of A112336. - Paul Barry, Sep 04 2005

Formula

a(n)=sum{k=0..floor(n/2), binomial(2(n-2k), n-2k)*2^k}.