23686

Appears in sequences

• Row sums of inverse of Riordan array (1/(1+x),x/(1+x)^4).at n=6A107026
• Number triangle associated to the Riordan arrays (1/(1+x),x/(1+x)^k),k>=0.at n=61A107027
• Number triangle associated with the Riordan arrays (1/(1+x),x/(1+x)^k),k>=0.at n=59A107030
• Number of fixed polyominoes with n cells that have fourfold rotational symmetry centered at the center of a cell.at n=39A348849
• Array read by antidiagonals: T(m,n) is the number of (non-null) induced trees in the grid graph P_m X P_n.at n=31A360202
• Array read by antidiagonals: T(m,n) is the number of (non-null) induced trees in the grid graph P_m X P_n.at n=32A360202
• Expansion of (1/x) * Series_Reversion( x / (1+x+x^4/(1+x)^3) ).at n=24A369592