139740domain: NAppears in sequencesNonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+281)^2 = y^2.at n=11A129626Number of permutations of [n] avoiding simultaneously consecutive patterns 1243, 1342, and 1324.at n=9A231166Number of ways to write n as an ordered sum of ten powers of 2.at n=33A342254