204480

Appears in sequences

• Expansion of (theta_3(z^4)^3 + theta_2(z^4)^3)^4.at n=23A028697
• Triangular numbers which are 10-almost primes.at n=4A101744
• Triangular numbers with only even digits.at n=18A117978
• a(0)=0; a(1)=1; a(n) = triangular number at index 5*2^(n-2)-1.at n=9A141499
• Triangle read by rows: a(1,1)=1. a(m,n) = a(m-1,n) + (sum of all terms in row m-1), for n<m. a(m,m) = sum of all terms in row m-1.at n=41A159930