# A148254 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 13 5 38 6 142 7 495 8 1999 9 7639 10 32410 11 131732 12 578108 13 2451480 14 11019463 15 48167875 16 220369210 17 985213006 18 4568163974 19 20777640886 20 97351386710 21 448791075548 22 2120304847549 23 9880144320349 24 46993584507492 25 220893243761056 26 1056471472307132 27 5001575487300376 28 24031415726411821