1817640

Appears in sequences

• a(n) = (3^n/n!) * Product_{k=0..n-1} (3*k + 2).at n=7A004988
• Triangle read by rows in which row n gives coefficients of polynomial R_n(y) that satisfies R_n(1/3) = 3^n, where R_n(y) forms the initial (n+1) terms of g.f. A057083(y)^(n+1).at n=35A097186
• Square array read by antidiagonals downwards: super Patalan numbers of order 3.at n=35A248324
• Triangle read by rows: Riordan array (1/(1-9x)^(2/3), x/(9x-1)).at n=28A283151