83848

Appears in sequences

• Coefficients of 1/(1-4x-16x^2)^(1/2); also, a(n) is the central coefficient of (1+2x+5x^2)^n.at n=7A084770
• Natural numbers written out with their digits grouped in sets of 5 (leading zeros omitted).at n=31A091341
• a(n) = prime(2^n) - n^2.at n=12A141102
• G.f.: A(x) = INV(x - x*INV(x - x^2*INV(x - x^3*INV(x - x^4*INV(x - ...))))), where INV(F(x)) = series reversion of F(x).at n=10A194956
• Number of (n+1) X 4 0..1 matrices with each 2 X 2 subblock idempotent.at n=17A224545
• a(0)=1; thereafter a(n) = n! + Sum_{i=0..n-1} a(i)*a(n-1-i).at n=8A229741
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of 1/sqrt(1 - 4*x - (2*k*x)^2).at n=52A387466