26166

Appears in sequences

• Number of triangular polyominoes (or triangular polyforms, or polyiamonds) with n cells (turning over is allowed, holes are allowed, must be connected along edges).at n=13A000577
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-2.at n=20A211958
• Minimal sum s of n distinct squares such that s is divisible by n.at n=41A215574
• E.g.f.: Sum_{n>=0} x^n * (exp(n*x) - 1)^n.at n=6A249409
• Number of permutations p of [n] such that |p(i) - p(i-1)| is in {1,3} for all i from 2 to n.at n=20A302118
• Indices of primes followed by a gap (distance to next larger prime) of 44.at n=34A320720
• Number of compositions of n such that every distinct consecutive subsequence has a different sum.at n=34A325676
• G.f. satisfies A(x) = 1 + x*A(x)^3 / (1 - x*A(x)^2)^3.at n=6A367241