517971

Appears in sequences

• Number of partitions of n^2 into up to n parts each no more than 2n, or of n(3n+1)/2 into exactly n distinct parts each no more than 3n.at n=10A109655
• Number of nondecreasing arrangements of n numbers in -5..5 with sum zero.at n=19A183913
• Number of 10-element subsets that can be chosen from {1,2,...,10*n} having element sum 50*n+5.at n=3A204474