# A019285 (b-file synthesized from sequence entry) 1 60 2 240 3 960 4 4092 5 16368 6 58254 7 61440 8 65472 9 116508 10 466032 11 710400 12 983040 13 1864128 14 3932160 15 4190208 16 67043328 17 119304192 18 268173312 19 1908867072 20 7635468288 21 16106127360 22 711488165526 23 1098437885952 24 1422976331052