# A074419 (b-file synthesized from sequence entry) 1 0 2 0 3 0 4 5 5 25 6 107 7 450 8 1950 9 8666 10 39050 11 177500 12 813490 13 3755048 14 17437275 15 81380200 16 381473625 17 1795156250 18 8477100632 19 40154687500 20 190734843750 21 908261160564 22 4334882723750 23 20732048658288 24 99341072183730 25 476837158203125 26 2292486345026923