23856

Appears in sequences

• E.g.f.: arctanh(sinh(x)*exp(x)).at n=7A012521
• Expansion of 1/(1-x^4-x^5-x^6-x^7-x^8-x^9-x^10-x^11-x^12).at n=38A017834
• Number of n X 6 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=4A207066
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=49A207068
• Number of 5Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=5A207072
• Triangle of coefficients of polynomials v(n,x) jointly generated with A209139; see the Formula section.at n=51A209140
• G.f.: exp( Sum_{n>=1} A002203(n)^4 * x^n/n ), where A002203 is the companion Pell numbers.at n=3A215171
• Volume of right circular cone (rounded down) with the diameter of base and height equal to n.at n=44A228189
• Numbers k such that 11^phi(k) == 1 (mod k^2), where phi(k) = A000010(k).at n=22A253016
• Triangle read by rows: T(n, k) = Sum_{t=k..n-3} (-1)^(t-k)*(n-t)!*binomial(t,k)*binomial(n-3,t).at n=41A264028
• Growth series for affine Coxeter group B_7.at n=11A267170
• Expansion of eta(q^2)^12 * eta(q^4)^8 / eta(q)^8 in powers of q.at n=15A286399
• a(n) = prime(n) + prime(n+1) * prime(n+2).at n=34A293206
• Sum of the prime parts in the partitions of n into 8 parts.at n=35A309469
• Numbers k such that (Sum of totatives of k) == 1 (mod Sum of primes dividing k with multiplicity).at n=46A340299