212982

Appears in sequences

• Number of Barlow packings with group P3m1 that repeat after n layers.at n=17A011953
• Triangle T(n,k) = binomial(n+2,k+1)*(binomial(n+2,k+1)-1), n >=0, 0 <= k <= n.at n=49A065420
• Expansion of Product_{k>=1} (1 + (2^k + 1) * x^k).at n=13A382976