# A027258 (b-file synthesized from sequence entry) 1 0 2 6 3 52 4 428 5 3552 6 29790 7 251980 8 2145822 9 18373296 10 158025186 11 1364247180 12 11815188000 13 102606325136 14 893175905778 15 7791151047204 16 68086757974300 17 595980599148672 18 5224392846601730 19 45857525238248604 20 402997448078904948 21 3545390129177031520 22 31221592914677352138