61809

Appears in sequences

• Number of lower triangles of an (n+4) X (n+4) 0..3 array with new values introduced in row major order 0..3 and no element unequal to more than one horizontal or vertical neighbor.at n=8A194773
• G.f.: A(x) = Sum_{n>=0} x^n * A(x)^(n^2) * (1 - A(x)^(2*n+1))/(1 - A(x)).at n=5A199544
• a(n) = A273059(4n).at n=44A275916
• Expansion of Sum_{k>=0} x^(k*(k+1)/2) * Product_{j=1..k} (1 + x^j)^j.at n=52A306733
• Expansion of (1/x) * Series_Reversion( x * (1-x) / B(x) ), where B(x) is the g.f. of A002293.at n=6A381914