# A028004 (b-file synthesized from sequence entry) 0 1 1 31 2 633 3 10787 4 166481 5 2416827 6 33681481 7 456072739 8 6046236801 9 78876961163 10 1016157547769 11 12960408919731 12 163959874019761 13 2060322716086939 14 25744836645629097 15 320169349603453763