159852

Appears in sequences

• Fourth accumulation array, T, of the natural number array A000027, by antidiagonals.at n=70A185509
• a(1)=1, a(2)=2; thereafter a(n+1) = Sum_{i=m..n} a(i) where m = (n+1)-k and k is the last digit of a(n), except if k=0, k=1, or k>n then a(n+1) = Sum_{i=1..n} a(i).at n=19A309311
• Wiener index in diamond nanowires obtained by connecting n unit cells in a sequence.at n=10A366816