# A136793 (b-file synthesized from sequence entry) 1 4 2 16 3 104 4 752 5 5996 6 50512 7 444256 8 4027360 9 37383044 10 353486320 11 3393093696 12 32976302800 13 323839605124 14 3208549483216 15 32033691247528 16 321955764477936 17 3254812520854980 18 33075467402453872 19 337670437247448728 20 3461635652745799136 21 35620112071990294784