20726199

Appears in sequences

• a(n) = n*3^n.at n=13A036290
• a(n) = (2n-1) * 3^(2n-1).at n=6A060851
• a(n) = (n+1)*(n+6)*3^n/6.at n=12A080420
• Egyptian fraction expansion for Pi/4 = arctan(1/2) + arctan(1/3) (Hutton 1776).at n=13A157327
• a(n) = n^6*(4*n+3).at n=9A229149
• Number of ascending runs in {1,...,9}^n.at n=7A229283
• a(n) = 13*3^n.at n=13A258597
• Numbers with prime factorization of the form p_1^p_2*p_2^p_3*...p_(n-1)^p_n*p_n where p_(n-1) < p(n) and n > 1.at n=15A294110