# A162441 (b-file synthesized from sequence entry) 2 3 3 15 4 35 5 315 6 693 7 1001 8 6435 9 109395 10 230945 11 969969 12 2028117 13 16900975 14 35102025 15 145422675 16 20036013 17 9917826435 18 20419054425 19 27981667175 20 172308161025 21 282585384081 22 964378691705 23 11835556670925 24 24185702762325