18732

Appears in sequences

• Multiply by 1, add 1, multiply by 2, add 2, etc., start with 1.at n=13A019464
• Expansion of (3+2*x^2)/(1-x)^4.at n=27A037236
• Numbers having four 4's in base 8.at n=23A043440
• Triangles in open triangular matchstick arrangement (triangle minus one side) of side n.at n=42A045947
• Sum of orders of all odd permutations of n letters.at n=6A060178
• a(0) = 1, a(n+1) = (n+1)*(a(n) + n).at n=7A085923
• Indices of primes in sequence defined by A(0) = 61, A(n) = 10*A(n-1) + 41 for n > 0.at n=17A101531
• Write 0, 1, ..., n in base 3 and add as if they were decimal numbers.at n=41A121718
• Triangular array T(n,k) giving number of 3-connected graphs with n labeled nodes and k edges (n >= 4, ceiling(3*n/2) <= k <= n(n-1)/2).at n=16A123542
• a(n) = n*(4*n^2 + n - 1)/2.at n=20A125200
• Number of binary strings of length n with equal numbers of 00110 and 01001 substrings.at n=15A164251
• Number of -n..n arrays x(0..4) of 5 elements with zero sum and elements alternately strictly increasing and strictly decreasing.at n=8A200059
• E.g.f.: 1 + Sum_{n>=1} 2*exp(n^2*x) / 2^n.at n=3A249940
• Number of (n+1) X (6+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=11A253433
• Number of (6+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=11A253440
• Numbers k such that 49*10^k + 1 is prime.at n=25A267865
• Number of matrices of size n whose entries cover an initial interval of positive integers.at n=5A323868
• Number of unlabeled loopless multigraphs with n edges covering four vertices.at n=31A328652
• Row sums of A352363.at n=8A352364
• G.f. satisfies A(x) = (1+x*A(x)^4)/(1-x)^2.at n=5A364630