# A175935 (b-file synthesized from sequence entry) 0 1 1 2 2 10 3 55 4 351 5 2401 6 17248 7 128221 8 978082 9 7612155 10 60204488 11 482481220 12 3909460725 13 31974923487 14 263623879118 15 2188682538746 16 18282238300443 17 153537981720402 18 1295640515428649 19 10980400434511117 20 93418283866708579