9565937

Appears in sequences

• a(0)=1, a(n) = 3*a(n-1) + 2; a(n) = 2*3^n - 1.at n=14A048473
• Number of alpha-beta evaluations in a tree of depth n and branching factor b=3.at n=28A060647
• Numbers of the form 3^m - 1 or 2*3^m - 1; i.e., the union of sequences A048473 and A024023.at n=29A062318
• a(n) is least odd integer not a partial sum of 1, 3, ..., a(n-1).at n=28A062547
• Second generation sequence in which each number is skipped that can be written as sum of distinct previous entries. To make the first generation we start with all natural numbers: this gives the powers of 2 (A000079). For the second generation we start with the natural numbers from which are removed the numbers of the first generation.at n=28A072134
• Sum of terms in periodic part of continued fraction expansion of square root of -1 + 3^n.at n=27A077631
• Sequence of sums of alternating powers of 3.at n=28A079362
• 2*3^n-(-1)^n.at n=14A081632
• Clique number of commuting graph of symmetric group S_n.at n=44A135908
• A048473 prefixed by two zeros.at n=16A154992
• a(n) = 2*9^n-1.at n=7A198859
• Least number k such that half of the numbers from 0 to k inclusive contain the digit n.at n=9A344474