23904

Appears in sequences

• Maximal length of rook tour on an n X n board.at n=32A006071
• Expansion of (theta_3(z)*theta_3(15z) + theta_2(z)*theta_2(15z))^4.at n=28A028628
• Even 9-gonal (or enneagonal) numbers.at n=41A028992
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 77.at n=31A031575
• a(n) = (2*n+1)*(7*n+1).at n=41A033572
• Triangle read by rows: T(n,k) (n >= 2, k >= 0) is the number of non-crossing connected graphs on n nodes on a circle, having k triangles. Rows are indexed 2,3,4,...; columns are indexed 0,1,2,....at n=22A089435
• Number of A095322-primes in range ]2^n,2^(n+1)].at n=19A095324
• Number of A095318-primes in range ]2^n,2^(n+1)].at n=19A095328
• Table B(m,n), read by antidiagonals, where B(m,n) is the number of ways integers 1,..,m*n can be put into an m X n grid so that every adjacent (NESW) pair of integers are coprime.at n=17A116542
• Table B(m,n), read by antidiagonals, where B(m,n) is the number of ways integers 1,..,m*n can be put into an m X n grid so that every adjacent (NESW) pair of integers are coprime.at n=18A116542
• Enneagonal numbers for which the product of the digits is also an enneagonal number.at n=27A117052
• Enneagonal numbers divisible by 9.at n=19A117796
• The Wiener index of a chain of n triangles (i.e., joined like VVV..VV; here V is a triangle!).at n=31A143941
• Expansion of g.f. 1 - 2*x*(-7 - 10*x + x^2)/(x - 1)^4.at n=16A152100
• Partial sums of [A080782^2].at n=40A164765
• Number of 4-step one or two space at a time rook's tours on an n X n board summed over all starting positions.at n=9A187289
• Number of compositions of n with difference 5 between the number of odd parts and the number of even parts, both counted without multiplicity.at n=6A242845
• Number of length n+2 0..2 arrays with at most one downstep in every n consecutive neighbor pairs.at n=14A255109
• Triangle read by rows: Kreweras's "Rule A_4 left thickness" numbers.at n=39A259099
• Numbers n such that n*2^2281 - 1 is prime.at n=20A265504