# A094837 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 10 5 24 6 46 7 100 8 225 9 525 10 1225 11 3136 12 7056 13 17640 14 44100 15 108900 16 261360 17 637065 18 1656369 19 4008004 20 10020010 21 25050025 22 64128064 23 155739584 24 393853824 25 1012766976