# A017524 (b-file synthesized from sequence entry) 0 0 1 20736 2 331776 3 1679616 4 5308416 5 12960000 6 26873856 7 49787136 8 84934656 9 136048896 10 207360000 11 303595776 12 429981696 13 592240896 14 796594176 15 1049760000 16 1358954496 17 1731891456 18 2176782336