753236

Appears in sequences

• a(n) is the A-sequence for the Riordan matrix R = (1/(1- x^2 - x^3), x/(1 - x^2 - x^3)) from A104578.at n=22A319202
• a(n) is the number of 2 X 2 matrices with elements 1..n where at least one row and at least one column is strictly increasing.at n=34A390922