# A108478 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 14 4 43 5 127 6 468 7 1596 8 5253 9 17917 10 60918 11 205194 12 694287 13 2351611 14 7951336 15 26894840 16 91004105 17 307854073 18 1041410602 19 3523170438 20 11918842803 21 40320750711 22 136404504124 23 461454010164 24 1561085306061 25 5281113937653