649539

Appears in sequences

• a(n) = (n-1)*3^(n-2), n > 0.at n=11A027471
• Numbers k such that k | 10^k + 9^k + 8^k.at n=22A057232
• Number of transpositions (interchanges of adjacent digits, sometimes called inversions) needed to change all n-digit base 3 numbers into nondecreasing order.at n=9A069515
• Numbers of the form (9^i)*(11^j), with i, j >= 0.at n=22A108687
• a(n) = 11*3^n.at n=10A120354
• Alternately form product and sum of all previous terms.at n=8A122961
• Number of 4-ary Lyndon words of length n with exactly five 1s.at n=7A124813
• Denominators of a ternary BBP-type formula for log(3).at n=10A154920
• a(n) = (2*n + 1)*9^n.at n=5A155988
• Numbers which can be expressed as the product of numbers made of only nines.at n=20A161147
• Denominators of ternary BBP-type series for log(5).at n=8A164985
• Triangle read by rows: T(n,k) is the number of 2-compositions of n having k columns with only nonzero entries (0<=k<=floor(n/2)).at n=43A181307
• Smallest number expressible in the form a^2 + 2b^2, with positive integers a and b, in exactly n ways.at n=10A200977
• (n-1)-st elementary symmetric function of the first n terms of the periodic sequence (1,1,1,3,1,1,1,3,...).at n=38A203235
• Row sums of A211230.at n=20A211231
• E.g.f.: Sum_{n>=1} x^(n^2) * exp(3*x^n) / n!.at n=10A265943
• Denominators of exponential expansion of (3/(2*log(1+x)))*(1 - 1/(1+x)^(2/3)).at n=10A284863
• Triangle T(n,k) = 3*T(n-1,k) + T(n-2,k-1) for k = 0..floor(n/2), with T(0,0) = 1 and T(n,k) = 0 for n < 0 or k < 0, read by rows.at n=43A304249
• Triangle T(n,k) = 3*T(n-1,k) + T(n-3,k-1) for k = 0..floor(n/3) with T(0,0) = 1 and T(n,k) = 0 for n or k < 0, read by rows.at n=36A317497
• Expansion of Sum_{n>=1} ( (3 + x^n)^n - 3^n ).at n=10A318638