22176

Appears in sequences

• a(n) = n*(n + 1)*(n^2 - 3*n + 6)/8.at n=20A004255
• Quintuple factorial numbers: Product_{k=0..n-1} (5*k+1).at n=5A008548
• a(n) is the concatenation of n and 8n.at n=21A009470
• a(n) = (n+1)*(2*n+1)*(3*n+1)*(4*n+1).at n=5A011245
• cos(log(x+1)-tan(x))=1-3/4!*x^4-90/6!*x^6+168/7!*x^7-4515/8!*x^8...at n=9A013238
• Expansion of e.g.f.: sech(log(x+1)-tan(x))=1-3/4!*x^4-90/6!*x^6+168/7!*x^7-4095/8!*x^8...at n=9A013245
• Pisot sequence T(4,9), a(n) = floor(a(n-1)^2/a(n-2)).at n=11A019492
• Coordination sequence for root lattice B_4.at n=9A022146
• a(n) = n + (n+1)^2 + (n+2)^3 + (n+3)^4.at n=9A027621
• a(n) = 3*(n+1)*binomial(n+5,6).at n=6A027811
• a(n) = 42*(n+1) * binomial(n+5,10).at n=2A027815
• Triangle of rooted planar maps up to orientation-preserving isomorphisms.at n=71A046653
• Triangle of numbers related to triangle A049375; generalization of Stirling numbers of second kind A008277, Lah-numbers A008297...at n=10A049385
• Iteration of unitary-sigma function: a(1) = 2, a(n) = usigma(a(n-1)).at n=22A059460
• Numbers that are the products of distinct substrings (>1) of themselves and do not end in 0.at n=26A059470
• Larger central (or median) divisor of n!.at n=11A060777
• Duplicate of A060777.at n=11A061056
• Numbers k such that k+1 is composite and divides 3^k-2^k.at n=38A068410
• Expansion of (1-x)^(-1)/(1-2*x+x^2+x^3).at n=27A077856
• G.f.: Product_{n >= 0} (1+x^(2n+1))/(1-x^(2n+1)).at n=42A080054