# A000766 (b-file synthesized from sequence entry) 1 4 2 32 3 292 4 2672 5 24780 6 232512 7 2201948 8 20997008 9 201314448 10 1938659936 11 18737136032 12 181646110192 13 1765522809468 14 17198432462368 15 167859941774728