# A082970 (b-file synthesized from sequence entry) 4 4 5 23 6 107 7 464 8 1950 9 8063 10 33033 11 134576 12 546312 13 2212550 14 8946454 15 36134656 16 145831270 17 588199815 18 2371435125 19 9557736480 20 38511326040 21 155143873170 22 624899673690 23 2516678580000 24 10134353299980 25 40805797511622