# A125023 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 12 4 31 5 78 6 208 7 551 8 1502 9 4117 10 11435 11 31926 12 89829 13 253727 14 719926 15 2048919 16 5848543 17 16732592 18 47973762 19 137788720 20 396393362 21 1141962118 22 3294080424 23 9512949813 24 27501182865 25 79579492065 26 230478715333