# A074430 (b-file synthesized from sequence entry) 1 0 2 0 3 3 4 12 5 36 6 162 7 1008 8 6048 9 33048 10 176256 11 940896 12 5038848 13 27433728 14 152845056 15 863910489 16 4899999744 17 27770211072 18 157340548224 19 892662156288 20 5078255822436 21 28988793435209 22 166023914360832 23 953309368018944 24 5484237660094464 25 31596861676172076