61930

Appears in sequences

• Numbers that define integer Heronian triangles [prime(a(n)), prime(a(n)+1), A068965(n)] with area A068966(n).at n=33A068964
• Number of 4-indecomposable (connected) graphs on n nodes.at n=25A128526
• Related to Fibonacci numbers, see the Formula section.at n=36A215082
• a(n) = A215082(2*n).at n=18A215108
• a(n) = a(n-2) + a(n-3) + a(n-4) with a(0) = 0, a(1) = a(2) = 1, a(3) = 0.at n=32A277252
• Concatenation of sum n+(n+1) and product n*(n+1) in decimal.at n=30A337148