491870

Appears in sequences

• A sum with next-to-central binomial coefficients of even order, Catalan related.at n=8A029760
• An accelerator sequence for Catalan's constant.at n=20A094650
• Total number of two-element anti-chains over all ordered trees on n edges.at n=10A139262
• Number of 8 X n binary arrays without the pattern 0 1 diagonally, vertically, antidiagonally or horizontally.at n=20A188559
• Expansion of (5-4*x-12*x^2+6*x^3+3*x^4)/(1-x-4*x^2+3*x^3+3*x^4-x^5).at n=20A189234
• Number of peaks at height >= 2 in all dispersed Dyck paths of length n (i.e., Motzkin paths of length n with no (1,0) steps at positive heights).at n=20A191309